thought she was having a heart attack; collapsed to the floor; had bruises to her elbows and knees; felt like puking or throwing up; oxygen level was horrible; Passed out/ collapsed to the floor; she couldn't speak or say full words because the pain was debilitating; extreme exhaustion; her first and second doses of COVID-19 vaccine were Moderna and third dose Pfizer; booster; Pericarditis; pressure in her upper chest.; Pain; soreness to her upper chest; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 53 year-old female patient received bnt162b2 (BNT162B2), administered in arm, administration date 16Dec2021 (Lot number: FE3590) at the age of 53 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Heart attack", start date: 2016 (unspecified if ongoing), notes: she had a heart attack 5 years ago; "Electrocardiogram QT prolonged" (unspecified if ongoing), notes: Verbatim: QT interval prolonged; "Cardiac issue" (unspecified if ongoing); "broken her hand" (unspecified if ongoing); "acid reflux" (unspecified if ongoing). Family history included: "Mother almost died due to COVID" (unspecified if ongoing), notes: Caller says because her mother almost died of COVID, and was in the ICU for a month. Concomitant medication(s) included: ASPIRIN [ACETYLSALICYLIC ACID], start date: 2016; METOPROLOL taken for heart rate, start date: 2016; DILTIAZEM taken for cardiac disorder, start date: 2016; LANSOPRAZOLE taken for gastrooesophageal reflux disease. Vaccination history included: Moderna covid-19 vaccine (First Dose, LOT: 023 then E or C, she can't tell, then Z then IA or 1A), administration date: 11May2021, when the patient was 52 years old, for COVID-19 Immunization; Moderna covid-19 vaccine (Second dose, LOT that she says is illegible but she can try to read it. She says it looks like: 007), administration date: 08Jun2021, when the patient was 52 years old, for COVID-19 Immunization. The following information was reported: INTERCHANGE OF VACCINE PRODUCTS (medically significant) with onset 16Dec2021, outcome "unknown", described as "her first and second doses of COVID-19 vaccine were Moderna and third dose Pfizer"; IMMUNISATION (medically significant) with onset 16Dec2021, outcome "unknown", described as "booster"; MYOCARDIAL INFARCTION (medically significant) with onset 04Jan2022, outcome "unknown", described as "thought she was having a heart attack"; PERICARDITIS (medically significant) with onset Dec2021, outcome "not recovered", described as "Pericarditis"; LOSS OF CONSCIOUSNESS (medically significant) with onset 04Jan2022, outcome "unknown", described as "Passed out/ collapsed to the floor"; PAIN (medically significant) with onset Dec2021, outcome "not recovered", described as "Pain"; CHEST PAIN (medically significant) with onset Dec2021, outcome "not recovered", described as "soreness to her upper chest"; FALL (medically significant) with onset 04Jan2022, outcome "unknown", described as "collapsed to the floor"; CONTUSION (medically significant) with onset 04Jan2022, outcome "recovering", described as "had bruises to her elbows and knees"; VOMITING (medically significant) with onset 04Jan2022, outcome "unknown", described as "felt like puking or throwing up"; PO2 DECREASED (medically significant) with onset 04Jan2022, outcome "recovered" (Jan2022), described as "oxygen level was horrible"; FATIGUE (medically significant) with onset Jan2022, outcome "not recovered", described as "extreme exhaustion"; CHEST DISCOMFORT (medically significant) with onset Dec2021, outcome "not recovered", described as "pressure in her upper chest."; SPEECH DISORDER (medically significant) with onset Jan2022, outcome "unknown", described as "she couldn't speak or say full words because the pain was debilitating". The events "thought she was having a heart attack", "pericarditis", "passed out/ collapsed to the floor", "pain", "soreness to her upper chest", "collapsed to the floor", "had bruises to her elbows and knees", "felt like puking or throwing up", "oxygen level was horrible", "extreme exhaustion", "pressure in her upper chest." and "she couldn't speak or say full words because the pain was debilitating" were evaluated at the physician office visit. The patient underwent the following laboratory tests and procedures: chest x-ray: (Jan2022) unknown results; coagulation test: (Jan2022) no blood clots; echocardiogram: (Jan2022) unknown results; electrocardiogram: (Jan2022) unknown results; fibrin d dimer: (Jan2022) normal; heart rate: (Jan2022) unknown results; oxygen saturation: (Jan2022) 90; (Jan2022) 98-100; sars-cov-2 test: (Jan2022) negative, notes: All ok; troponin: (Jan2022) normal. Therapeutic measures were taken as a result of myocardial infarction, pericarditis, loss of consciousness, pain, chest pain, fall, contusion, vomiting, po2 decreased and it was mentioned as the Tylenol dose she had took she didn't know, and they gave her Fentanyl IV and all kinds of pain meds while she was in the hospital, and they gave her an anti-inflammatory in the hospital. The patient said they did not admit her to the hospital due to her Troponin level and D-dimer being ok. She said that she had had other cardiac issues in the past, so she didn't know how they would not want to monitor her, she had a heart attack 5 years ago, but that didn't feel like this constant horrific pain. Caller clarified that she was taking Dual Action Advil with Acetaminophen, 250mg, and she was taking two pills, two to three times a day. She clarified they were tablets, Dual Action Advil with Acetaminophen NDC/UPC/LOT/EXP: Unknown. Caller said at the hospital they tried 3-4 different things, she couldn't speak or felt her arm because she was in so much horrific pain and she was presenting like from the pain for all different things. She said they gave her an EKG, and a chest x-ray, but they didn't do a CT scan, they did a resting heart rate, but did not do MRI to find out if there was fluid around her heart, which she had a complaint at the hospital about that.    Clinical course: Caller says the adverse effect was pericarditis, which started a day to two days later after the dose. She says she had soreness to her upper chest that was prominent all day long and didn't go away, but she ignored it. She says it never went away, so she took Tylenol and stuff. Caller says on Tuesday of last week she woke up from a sound sleep and thought she was having a heart attack. She says she collapsed on the floor and had bruises to her elbows and knees, and felt like puking or throwing up, and passed out. Caller says she  taken by ambulance out of the house, her oxygen level was horrible. She says her oxygen came back up, and they did tests on her. She says right now they had her get an echocardiogram this morning. She says while she was at the hospital she was inundated with tests including COVID, D-dimer, and Troponin, which were all ok, so they said they could handle her care out patient, but now she has results from the echocardiogram which she will have soon, and her primary doctor called in steroids, because she was still in so much pain, to see if that would alleviate it. Caller says her primary doctor said if the steroids ended up working, she would be pretty sure that she has pericarditis, and the steroids are working two days later. She says they had questioned if it could be esophageal spasms, but those wouldn't keep going like this, and the steroids are working to help alleviate pain. She says that she still has extreme exhaustion and pressure in her upper chest.  Caller clarifies that it was on 04Jan2022 when she went by ambulance because the pain in her chest had gotten worse. She says at first for a week it stayed the same and then it became more intense, and she is a total procrastinator with a high pain tolerance. She provides examples of previously having an eardrum almost ready to perforate and her doctor asking why she waited to come in because it had to have been like that for a week and she told her doctor that she didn't feel it. She says she also had broken her hand twice in the past and didn't go to the doctor right away either time. She says these things occurred prior to her recent vaccinations. She says her point is that this recent pain had been nagging her all day long and she was like I can breath and is not a whistleblower, so she had waited to be seen for it.