I am sick today; couldn't walk; Vertigo; Dizziness; Nausea/nauseous; 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. Other Case identifier(s): US-PFIZER INC-202101524416 (Pfizer).  A 82 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 31Aug2021 (Lot number: EW0178) at the age of 82 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "hearing aids" (unspecified if ongoing), notes: wears hearing aids. There were no concomitant medications. Vaccination history included: Bnt162b2 (First Dose: At first caller states that it was given on 05Mar2021, but then states he can't read the handwriting it might have been given on 15Mar2021. He can't read the handwriting for the lot number, but thinks it is ED6204. Expiry: Unknown. NDC: Unknown.), administration date: 15Mar2021, when the patient was 82 years old, for Covid-19 immunization; Bnt162b2 (Second Dose: given on 08Apr2021. Lot number: EP6955. NDC: unknown. Expiry: unknown.), administration date: 08Apr2021, when the patient was 82 years old, for Covid-19 immunization.  The following information was reported: VERTIGO (non-serious) with onset 01Sep2021, outcome "not recovered", described as "Vertigo"; DIZZINESS (non-serious) with onset 01Sep2021, outcome "not recovered", described as "Dizziness"; NAUSEA (non-serious) with onset 01Sep2021, outcome "not recovered", described as "Nausea/nauseous"; ILLNESS (non-serious) with onset 05Nov2021, outcome "not recovered", described as "I am sick today"; GAIT DISTURBANCE (non-serious) with onset 01Sep2021, outcome "not recovered", described as "couldn't walk". Therapeutic measures were taken as a result of vertigo, dizziness, nausea.  Additional information: He reports that yesterday, a month later, all symptoms came back: dizzy, nausea, can't walk, still not feeling well. Reporter asked was there any information about having the same symptoms a month later. Reporter continued, It was reoccurrence of the activity the day after he got his booster shot. It was the same reaction, but a month later. Reporter stated that he had Pfizer COVID booster shot on 31Aug2021. The next morning 01Sep2021 he was nauseous, had vertigo, was dizzy, couldn't walk, and felt sick. He called his doctor who called him in a nausea pill and he took that for 3 days then felt better. Yesterday, a month later he felt dizzy, nauseous, and can't walk. He started the nausea pills again and is still not feeling well. Previous day he was in the house all day and didn't get out of bed. He took 3 pills previous day and one that day. Meclizine was the nausea and vertigo medication. The dizziness was really bad. Then yesterday, 04Nov2021, he felt it all again. He took an inhaler that helped him keep breathing. It hadn't started working yet. It said to take one tablet by mouth 3 times day for dizziness. The one he took this morning is not working yet. He just called his doctor and explained what was going on. He had been his doctor for 30 years. Reporter stated this was a side note, but the doctor didn't believe in getting the shot and died a month ago. Reporter didn't know what from. The doctor was 64 years old and he was against getting the shot. Reporter called the office yesterday to make an appointment and they told him that the doctor had died.   Follow-up attempts are completed. No further information is expected.