Interchange of vaccine products; inflammation of the muscled in the heart wall/possibly a muscle inflammation; fluttering, or pounding heart; gas pain; chest pains; blood pressure elevated; sneezing; felt light headed; I was struggling to walk; Shortness of breath; Feelings of having a fast-beating; fluttering, or pounding heart; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 67-year-old female patient received bnt162b2 omi xbb.1.5 (COMIRNATY (2023-2024 FORMULA)), on 09Nov2023 as dose 1, single (Batch/Lot number: unknown, Expiration Date: 2024) at the age of 67 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "sensitive to preservatives" (unspecified if ongoing); "I got exposed to Poison Ivy" (unspecified if ongoing), notes: got exposed to Poison Ivy and I used calamine lotion on it; "Hypophosphatasia" (ongoing), notes: take Strensiq; "got covid back in 2022" (unspecified if ongoing), notes: she got covid back in 2022, not hospitalized, had another case of covid in Jul2023.; "bone disease" (unspecified if ongoing). Concomitant medication(s) included: STRENSIQ taken for hypophosphatasia. Past drug history included: Thimerosal, reaction(s): "allergic to thimerosal"; Benadryl, reaction(s): "allergic to Benadryl"; Caladryl, reaction(s): "skin to completely wave off", notes: when I use Caladryl which is mixed with Benadryl it causes my skin to completely wave off; Benadryl, reaction(s): "skin to completely wave off", notes: when I use Caladryl which is mixed with Benadryl it causes my skin to completely wave off; Diclofenac sodium, reaction(s): "anaphylactic to Diclofenac Sodium". Vaccination history included: Bnt162b2 (Dose 1, single), for Covid-19 Immunization; Bnt162b2 (Dose 2, single), for Covid-19 Immunization; Moderna covid-19 vaccine (Dose 3 (Booster), single), administration date: 2022, for Covid-19 Immunization, reaction(s): "flu-like symptoms", "achy"; Bnt162b2 nos (Dose 4 (Booster), single), for Covid-19 Immunization; Bnt162b2;bnt162b2 omi ba.4-5 (Dose 5 (Booster), single), administration date: 2023, for Covid-19 Immunization; Flu vaccine, for Immunization, reaction(s): "lump to the size of soft ball on my arm", "my arm swelled up". The following information was reported: RESPIRATION ABNORMAL (non-serious) with onset 10Nov2023, outcome "unknown", described as "Feelings of having a fast-beating"; GAIT DISTURBANCE (non-serious) with onset 10Nov2023, outcome "unknown", described as "I was struggling to walk"; DYSPNOEA (non-serious) with onset 10Nov2023, outcome "unknown", described as "Shortness of breath"; BLOOD PRESSURE INCREASED (hospitalization) with onset 10Nov2023, outcome "unknown", described as "blood pressure elevated"; CHEST PAIN (hospitalization) with onset 10Nov2023, outcome "recovered", described as "chest pains"; DIZZINESS (non-serious) with onset 10Nov2023, outcome "unknown", described as "felt light headed"; CARDIAC FLUTTER (hospitalization), PALPITATIONS (non-serious) all with onset 10Nov2023, outcome "unknown" and all described as "fluttering, or pounding heart"; FLATULENCE (hospitalization) with onset 10Nov2023, outcome "not recovered", described as "gas pain"; MYOCARDITIS (hospitalization) with onset 10Nov2023, outcome "unknown", described as "inflammation of the muscled in the heart wall/possibly a muscle inflammation"; SNEEZING (non-serious) with onset 10Nov2023, outcome "unknown"; INTERCHANGE OF VACCINE PRODUCTS (hospitalization), outcome "unknown". The events "gas pain" and "chest pains" required emergency room visit. The patient underwent the following laboratory tests and procedures: Blood pressure measurement: elevated; Blood test: pretty good; Electrocardiogram: not having a heart attack. Therapeutic measures were taken as a result of myocarditis, flatulence, chest pain. Clinical course: Caller was calling in regard the Pfizer Covid-19 vaccine. She had taken a total of 6 Covid-19 vaccines with one Moderna. She had some adverse reactions and was not sure if that was because of recent vaccine. She wants to know if the recent vaccine has flu vaccine in it. Handled in this req: Caller wants to know any safety information on the side effects she experienced particular to the doctor's comment on her heart lining's inflammation potentially caused by the vaccine. Caller mentioned that she got a series of vaccines last year which were spaced a month apart. She was able to figure out that it was the flu vaccine that caused her to have an adverse reaction - a softball size lump on her arm after getting the flu vaccine.  She had 2 Pfizer Covid-19 vaccines and then 1 Moderna. She had a mild reaction to the Moderna vaccine- felt achy and exhausted with flu-like symptoms but no fever. Because of this, she went back to getting the Pfizer Covid-19 vaccines where she got 2 more shots. She was given the latest Pfizer Covid-19 vaccine on the 9th and started having a reaction on the 10th. She elaborates, after getting the vaccine, she had a lot of sneezing in the afternoon. Noon of next day, the 10th, she had a cup of coffee and felt a heart attack like sharp pains, throbbing pains, and felt light headed." She took two antacids because she thought it was just gas pain.  So she got antacid 2 pcs, she thought just gas pain, but not relieved. She was not relieved after taking the antacids getting worse" so she took baby aspirin, "but the pains continued. She went to the nearest hospital. "They agreed that I am having chest pains and my blood pressure elevated." They also said to her that they don't think it is a heart attack but it is possible that there is inflammation of the muscled in the heart wall. After taking Aleve, the throbbing pain was gone.  Caller added that she is allergic to thimerosal and very sensitive to preservatives. After hearing the response, she mentioned that four of her grandparents all had heart conditions and she might have inherited the heart condition. Chest pain, Shortness of breath, Feelings of having a fast-beating, fluttering, or pounding heart. Caller mentioned she is allergic to thimerosal and preservatives. Caller had several side effects after getting the most recent Pfizer Covid-19 vaccine.  Patient was anaphylactic to Diclofenac Sodium and taken Benadryl, Baby Aspirin, Caladryl, Diclofenac Sodium, Flu Vaccine and Strensiq for Hypophosphatasia   Patient recently had sixth vaccine and that was on 09Nov (09Nov2023). Patient had muscle spams around left side of heart and underneath heart. Consumer stated, "Right, drove myself to the emergency room because first, got an Antacid that was usually what it was. Patient drove to the nearest hospital and had EKG immediately, they did blood work and so on and they said patient not had heart attack, your blood work looks pretty good. They agreed with patient so, what patient wound up doing was that patient took Aleve, patient took 2 Aleve and had to take it again the next day and on the third day patient was fine, so that was the solution to it and they agreed with me that it was possibly a muscle inflammation and so it reacted to the Aleve in exactly that way with the throbbing at ease and the pain became ease.  just took 2 Antacid. Patient had many allergies and some of my allergies can be anaphylactic and they are unusual got rash and got Poison Ivy.  The information on the batch/lot number for bnt162b2 omi xbb.1.5 has been requested and will be submitted if and when received.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202201212574 same patient, different vaccine dose/event;