Booster; feeling out of breath; tired all the time; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 85 year-old female patient received bnt162b2 (BNT162B2), administration date 21Oct2021 (Lot number: EW0185) at the age of 85 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Blood pressure abnormal" (unspecified if ongoing), notes: Metoprolol 50mg tablet, 1/2 tablet once daily at night before vaccine; "breaks out and reacts to penicillin" (unspecified if ongoing), notes: breaks out and reacts to penicillin and other medications, no further information provided; "she's allergic to about 15-20 different medications" (unspecified if ongoing); "had a problem with her neck" (unspecified if ongoing), notes: she knew she had had a problem with her neck in the past. Concomitant medication(s) included: ASPIRIN [ACETYLSALICYLIC ACID] taken for anticoagulant therapy (ongoing); METOPROLOL taken for hypertension; LOSARTAN; PREGABALIN; HYDRALAZINE; AMLODIPINE. Vaccination history included: Bnt162b2 (Dose Number:01, Lot: EL8982, Time: around 9:30-10am), administration date: 22Jan2021, when the patient was 85 years old, for Covid-19 Immunization; Bnt162b2 (Dose Number:02, Lot: EL9266, Time: afternoon, Anatomical Location: left arm), administration date: 20Feb2021, when the patient was 85 years old, for Covid-19 Immunization, reaction(s): "high blood pressure", "Severe headache", "Jittery".  The following information was reported: IMMUNISATION (non-serious) with onset 21Oct2021, outcome "unknown", described as "Booster"; DYSPNOEA (non-serious) with onset 2021, outcome "unknown", described as "feeling out of breath"; FATIGUE (non-serious) with onset 2021, outcome "unknown", described as "tired all the time". The events "feeling out of breath" and "tired all the time" were evaluated at the physician office visit and emergency room visit. Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: The patient had a problem with her neck in the past; she doesn't remember the name of it, but it's where her blood runs from her heart up to her brain, but that was awhile ago. She received the booster dose on 21Oct2021 in the afternoon, since then she had been feeling out of breath. States that she was used to doing stuff, like cleaning her house, and going up and down the stairs, but now walking around her house gets her out of breath. She called the doctor's last week on 02Dec2021. The new doctor was in the office, so she went in to see him. He was very thorough and sent her the next morning to the Cardiologist. The Cardiologist put a monitor on her heart for 48 hours; she just mailed it in the day before yesterday. They also did bloodwork and an EKG. On Monday she went to see Dr. which was a follow up appointment. States that Dr works in the same office as the Cardiologist, but she does the blood pressure. States that she initially saw the Cardiologist after going to the ER but the Cardiologist didn't really do anything so he told her to see Dr. States that since getting the booster she feels tired all the time and she is not used to that. States that something with this vaccine is not settling with her. She doesn't even get the flu vaccine because she's allergic to about 15-20 different medications; she breaks out and reacts to penicillin and other medications, no further information provided. States that maybe she shouldn't have taken the vaccine since she is allergic to so much, but then states that even knowing the reaction she has had, she would probably still get it because she knows of people who have died from Covid because they didn't get vaccinated. She told the doctor about her reaction and was wondering if there was someone to report it to, she is glad she found the phone number. States that she knows that everyone doesn't react the same, and she didn't have all this wrong before. States that all this is scaring the hell out of her. She knows she is old and that she is going to die someday, but she can't help but believe that this has something to do with the vaccine. States that she is tired all the time and she just isn't used to that. No additional Vaccines Administered on Same Date of the Pfizer Suspect. No prior Vaccinations (within 4 weeks) and no AE following prior vaccinations no Medical History (including any illness at time of vaccination) and no family Medical History Relevant to AE.  Follow-up attempts are completed. No further information is expected.