fatigue; weakness; anxiety; pain in the extremities; numbness and tingling in the extremities; numbness and tingling in the extremities; booster; fluttering heartbeat; allergic reactions; pounding heart beat/feeling her heart beat going crazy; This is a spontaneous report received from a contactable reporters (Consumer or other non HCP, husband and patient) from medical information team for a Pfizer sponsored program (159558).  A 41 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 27Nov2021 11:00 (Lot number: FS1620) at the age of 41 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "thyroid" (ongoing); "intestinal issue" (not ongoing), notes: not sure about medications, had every test possible in the last 2 years, blood work, CAT scans, MRIs and colonoscopy, her original problems appears to have been solved based on the last tests. Concomitant medication(s) included: SYNTHROID taken for thyroid disorder (ongoing), Liothyronine 5mcg was also for thyroid that patient has not taken yet. Vaccination history included: Bnt162b2 (First Dose, LOT: ER8735, Anatomical Location: left arm), administration date: 01Apr2021, when the patient was 41 years old, for Covid-19 immunization, reaction(s): "she was fine"; Bnt162b2 (Second dose, LOT: ER8731, Anatomical Location: left arm), administration date: 23Apr2021, when the patient was 41 years old, for Covid-19 immunization, reaction(s): "she was fine"; Flu shot (flu shot 5 weeks prior), when the patient was 41 years old, for immunisation. No prior vaccinations (within 4 weeks). No additional vaccines administered on same date of the Pfizer suspect. The following information was reported: IMMUNISATION (medically significant) with onset 27Nov2021 11:00, outcome "unknown", described as "booster"; CARDIAC FLUTTER (medically significant) with onset 27Nov2021, outcome "not recovered", described as "fluttering heartbeat"; HYPERSENSITIVITY (non-serious) with onset 27Nov2021, outcome "unknown", described as "allergic reactions"; PALPITATIONS (non-serious) with onset 27Nov2021, outcome "not recovered", described as "pounding heart beat/feeling her heart beat going crazy"; PAIN IN EXTREMITY (non-serious) with onset Dec2021, outcome "not recovered", described as "pain in the extremities"; HYPOAESTHESIA (non-serious), PARAESTHESIA (non-serious) all with onset Dec2021, outcome "not recovered" and all described as "numbness and tingling in the extremities"; FATIGUE (non-serious), outcome "unknown", described as "fatigue"; ASTHENIA (non-serious), outcome "unknown", described as "weakness"; ANXIETY (non-serious), outcome "unknown", described as "anxiety". Patient experienced allergic reactions to the Pfizer Covid-19 booster shot, experienced fluttering heartbeat, pounding heart beat, pain, numbness and tingling in the extremities; completely numb in both hands and legs, and the entire arm, both arms a few weeks later, maybe a week or two later, after the booster shot. She'd been to see physicians and said that she has set up to go see rheumatologist, neurologist, hematologist. Reporter wanted to know who specifically she should be seeing about this if there's something specific they can help with these specific side effects, what should they looking for and asking about specific treatment about these allergic reactions. Patient had been called the doctors and they can't help. She felt like she poisoned herself. She thought it (booster dose) will give her a safe but it ruined her life. Patient also had weakness, fatigue and all that other stuff. The doctor pretty much told patient that she has anxiety and to get over it, reporter stated he did not think that would be useful. Patient had been bedridden for almost a month as of 22Dec2021. As soon as she was out of bed, minutes later, she started feeling her heartbeat going crazy. At times, she was feeling is a little bit better but has been having heart issues.  The events "fluttering heartbeat", "allergic reactions", "pounding heart beat/feeling her heart beat going crazy", "fatigue", "weakness", "anxiety" were evaluated at the emergency room visit. The events "pain in the extremities" and "numbness and tingling in the extremities" were evaluated at the physician office visit and emergency room visit (she went on 20Dec2021 but it was packed so she didn't stay). The event "numbness and tingling in the extremities" was evaluated at the physician office visit. Patient was not admitted to the hospital. She did routine tests and was sent home. The patient underwent the following laboratory tests and procedures: investigation: (Dec2021) found nothing. Therapeutic measures were not taken as a result of cardiac flutter, hypersensitivity, palpitations, pain in extremity, hypoaesthesia, paraesthesia, fatigue, asthenia, anxiety.   Follow-up attempts are completed. No further information is expected.