feeling worse; Keep scratching right arm, very itchy; had a temperature of 99.99 and then 100 for two days/higher temperature; Was very, very dizzy; Very Sleepy; Eyes feel very strained; Keep scratching right arm, very itchy; Weakness in legs; very severe pains in arm, total arm; Very severe aches and pains; eyes are blurry; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 79 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 21Oct2021 15:30 (Lot number: FF2587, Expiration Date: 31Dec2021) at the age of 79 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Atrial fibrillation", start date: 2013 (ongoing), notes: Verbatim: AFib; Diagnosed with after lung surgery in 2013.; "Lung Cancer", start date: 2013 (unspecified if ongoing); "lung surgery", start date: 2013, stop date: 2013. Concomitant medication(s) included: BABY ASPIRIN (ongoing). Vaccination history included: Bnt162b2 (1st dose of covid vaccine, Lot: EL9262, NDC: Unknown , Expiration: 31May2021 , Anatomical Location: left arm), administration date: 25Jan2021, when the patient was 79 years old, for COVID-19 Immunization; Bnt162b2 (2nd dose of covid vaccine, lot: EL9266, NDC: Unknown , Expiration: 31May2021 , Route of administration: The caller can't be sure, thinks left arm, believes left arm since asked if right handed and typically want to administer in less dominant arm, caller is right handed), administration date: 15Feb2021, when the patient was 79 years old, for COVID-19 Immunization. The following information was reported: PAIN (non-serious) with onset 21Oct2021, outcome "recovering", described as "Very severe aches and pains"; BODY TEMPERATURE INCREASED (non-serious) with onset 22Oct2021, outcome "not recovered", described as "had a temperature of 99.99 and then 100 for two days/higher temperature"; DIZZINESS (non-serious) with onset 22Oct2021, outcome "not recovered", described as "Was very, very dizzy"; SOMNOLENCE (non-serious) with onset 22Oct2021, outcome "unknown", described as "Very Sleepy"; ASTHENOPIA (non-serious) with onset 22Oct2021, outcome "not recovered", described as "Eyes feel very strained"; PRURITUS (non-serious), SCRATCH (non-serious) all with onset 22Oct2021, outcome "recovering" and all described as "Keep scratching right arm, very itchy"; MUSCULAR WEAKNESS (non-serious) with onset 22Oct2021, outcome "not recovered", described as "Weakness in legs"; PAIN IN EXTREMITY (non-serious) with onset 21Oct2021, outcome "unknown", described as "very severe pains in arm, total arm"; VISION BLURRED (non-serious) with onset Oct2021, outcome "unknown", described as "eyes are blurry"; MALAISE (non-serious) with onset 26Oct2021, outcome "unknown", described as "feeling worse". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information: Concomitant Products baby Aspirin: The caller takes baby Aspirin every morning because it was recommended by Cardiologist to take baby Aspirin if not going in for any medical procedures and caller did not want to take Eliquis. Patient history: AFib (From: 2013 To: Ongoing) Additional Information for Other Conditions: Diagnosed with after lung surgery in 2013. Patient history: Lung Cancer (From: 2013 To: Unspecified); Investigation Assessment: No. The caller received Pfizer Covid 19 Vaccine first dose in Jan2021 and second dose Pfizer Covid 19 Vaccine in Feb2021 at withheld. The caller received the third dose Pfizer Covid 19 Vaccine on 21Oct2021 at withheld. The caller reports having a severe reaction after receiving third dose Pfizer Covid 19 Vaccine. Has not gone to the emergency room: The caller called the cardiologist and was told to go the emergency room but the caller has not gone to the emergency room because the caller has an annual CAT scan for a lung cancer situation scheduled for tomorrow morning, 27Oct2021 at withheld. The caller did not want to be held over at the hospital. The caller has had experiences at withheld hospital before. withheld holds over when forget to give contrast and want to do CT scan for blood clotting at withheld. Very severe aches and pains: The caller symptoms are very severe aches and pains. For the very first time in callers entire life, very severe pains in arm, total arm. The caller thinks this arm pain is due to the fact the person who administered the third dose Pfizer Covid 19 Vaccine administered very high up on the callers arm, near the bone. The caller had a temperature of 99.99 and then 100 for two days. Was very, very dizzy: The caller was very, very dizzy. On Friday, 22Oct2021, the caller went to work. The caller received the third dose Pfizer Covid 19 Vaccine on at 1530 on Thursday, 21Oct2021. The caller went home from work on 22Oct2021 because was so dizzy. The caller was unable to really get out of bed. The caller was sleepy and very dizzy. The callers eyes feel very strained. The caller has weakness in legs. The caller keeps scratching right arm, very itchy. The caller returned to vaccination site on Friday, 22Oct2021, on the way home from work to tell them the callers symptoms. The caller stood on side line waiting to speak to the Pharmacist. The pharmacist was administering injections to other people. The pharmacist screamed at the caller that he was busy and the caller would have to wait for half an hour to an hour. The person behind counter at pharmacy got another person on the phone from another pharmacy and the person on the phone said the callers reaction was pretty normal and to go home and rest and that was it. The caller did call Cardiologist and the cardiologist told the caller to go the emergency room. The caller was reluctant to go to the emergency room because caller has CAT scan scheduled for tomorrow, 27Oct2021 and it is difficult to program at withheld and the CAT scan is critical to the callers health. The caller is a little concerned because the caller did not have this kind of severe reaction after receiving first and second dose Pfizer Covid 19 Vaccine. weight: 106 pounds or 108 pounds. Very severe aches and pains: Began the evening of 21Oct2021 and is going away. had a temperature of 99.99 and then 100 for two days: This began the morning of 22Oct2021. The callers normal temperature ranges from 96.7 to 97.7 and right now the callers temperature is 98.1. Was very, very dizzy: This began on the morning of 22Oct202. Caller clarifies it was very noticeable on the morning of 22Oct2021. The dizziness is ongoing and very severe today, 26Oct2021. Very Sleepy: This began on Friday, 22Oct2021. When caller left work she was very dizzy and very sleepy and when the caller got home she immediately fell asleep. The caller does not even recall falling asleep or waking up.  Fortunately, the caller had Saturday, Sunday, Monday and Tuesday off work. The caller has periods where caller is better and then just reverses. Eyes feel very strained: Very noticeable on Friday morning, 22Oct2021. Came along with dizziness and waking up and moving eyes and eyes feeling strained. it seems worse today, 26Oct2021 than yesterday, 27Oct2021. Weakness in legs: This began 22Oct2021 and is persisting. Keep scratching right arm, very itchy: This began on Friday, 22Oct2021. The itching is in the crook of the arm. The caller states not as itchy today, 26Oct2021 as it was yesterday, 25Oct2021 but has itched all of those days. Eyes feel very strained: Caller states the lot is hard to see on the vaccine card because the callers eyes are blurry. Caller hoping someone at Pfizer would tell the caller what to do regarding symptoms caller is reporting. Caller states if this call is only for Pfizers benefit please let the caller know at this time. Caller states she needs to caller her doctor and tell the doctor the caller is feeling worse today, 26Oct2021 and has a higher temperature today, 26Oct2021, than the caller did yesterday, 25Oct2021.   Follow-up attempts are completed. No further information is expected.