had a sensitivity to the Pfizer Covid 19 vaccine; convulsions; bad dry heaves; caused damage to my 2 and 3 vertebrae from hacking and coughing; caused damage to my 2 and 3 vertebrae from hacking and coughing; throwing up; had really bad stomach; very nauseous; lot of pain; back is not functioning; can't work or be up mobile for an 8 hour period; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 64-year-old male patient received BNT162b2 (BNT162B2), in Dec2021 as dose 2 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history was not reported. The patient took concomitant medications. Past drug history included: Codeine, reaction(s): "allergic to codeine", notes: Caller is allergic to codeine, makes caller itch; Codeine, reaction(s): "makes caller itch", notes: Caller is allergic to codeine, makes caller itch. Would take whenever needed but has not had codeine in a long time, one doctor gave caller codeine and caller broke out with itching and doctor said caller is allergic and to never use codeine again. Vaccination history included: Covid-19 vaccine (Dose: 1, Unknown manufacturer), for Covid-19 Immunization, reaction(s): "had no issues"; Flu shot (got a flu shot but unknown if at the same time or if flu shot was spaced apart, but doesn't recall time frame), for Immunization. The following information was reported: MUSCULOSKELETAL DISCOMFORT (hospitalization) with onset Dec2021, outcome "not recovered", described as "back is not functioning"; RETCHING (hospitalization) with onset Dec2021, outcome "recovered", described as "bad dry heaves"; IMPAIRED QUALITY OF LIFE (non-serious) with onset Dec2021, outcome "not recovered", described as "can't work or be up mobile for an 8 hour period"; SPINAL COLUMN INJURY (hospitalization), COUGH (hospitalization) all with onset Dec2021, outcome "recovered" and all described as "caused damage to my 2 and 3 vertebrae from hacking and coughing"; SEIZURE (hospitalization) with onset Dec2021, outcome "recovered", described as "convulsions"; SENSITISATION (hospitalization) with onset Dec2021, outcome "recovered", described as "had a sensitivity to the Pfizer Covid 19 vaccine"; ABDOMINAL DISCOMFORT (hospitalization) with onset Dec2021, outcome "recovered", described as "had really bad stomach"; PAIN (hospitalization) with onset Dec2021, outcome "not recovered", described as "lot of pain"; VOMITING (hospitalization) with onset Dec2021, outcome "recovered", described as "throwing up"; NAUSEA (hospitalization) with onset Dec2021, outcome "recovered", described as "very nauseous". The patient was hospitalized for sensitisation, seizure, retching, spinal column injury, cough, vomiting, abdominal discomfort, nausea, pain, musculoskeletal discomfort (start date: Dec2021). The events "back is not functioning" and "can't work or be up mobile for an 8 hour period" required physician office visit. The events "had a sensitivity to the pfizer covid 19 vaccine", "convulsions", "bad dry heaves", "caused damage to my 2 and 3 vertebrae from hacking and coughing", "throwing up", "had really bad stomach", "very nauseous" and "lot of pain" required physician office visit and emergency room visit. The patient underwent the following laboratory tests and procedures: Cardiac stress test: Unknown Results; Computerised tomogram: Unknown Results; pictures: Unknown Results; Magnetic resonance imaging: Unknown Results; Ultrasound scan: Unknown Results. Therapeutic measures were taken as a result of sensitisation, seizure, retching, spinal column injury, cough, vomiting, abdominal discomfort, nausea, pain, musculoskeletal discomfort, impaired quality of life. Additional information: Patient was initially asking if he can get Abrysvo if he had a sensitivity to the Pfizer COVID-19 vaccine. He got 1st COVID shot, which was not Pfizer, that was the "one shot deal" and had no issues. Then he went to get booster and got the Pfizer COVID-19 booster in Dec2021 and had bad side effects and ended up in the hospital the next day. Patient had convulsions and bad dry heaves which caused damage to his 2 and 3 vertebrae from hacking and coughing. He wound up in the hospital and they had to put him on morphine. It was a nightmare, he was throwing up, he had really bad stomach, it was pretty bad. Took the Pfizer COVID-19 booster vaccine on a Saturday in Dec2021 and then next day, on Sunday, was out cleaning up after dogs and got hit with what caller would consider similar to when drinking and get dry heaves, patient was bent over dry heaving, nothing coming up, had already eaten breakfast but was not vomiting, just dry heaving and convulsing, which happened once, then stood up, waited seconds, then came back again, wasn't as severe, then came back again less severe, then didn't happen again. The following day woke up, was in a lot of pain on the right side, very nauseous, went to work anyway, around 12 couldn't take anymore, called ambulance which took him to hospital. Reaction got worse. Patient was admitted to the hospital. Went to hospital, stabilized him, kept him overnight, everything subsided, gave him shots, morphine, checked stomach, severe nausea calmed down. Was told to see orthopedic and he was let go from hospital. Next day or day after came back bad, drove himself back to hospital, admitted again for 2 days for observation, given more morphine, then all symptoms went away from the shot. Had pain in back excruciating, started with orthopedics, said patient has damage to 2nd and 3rd vertebrae on right side. Saw physical therapists, got shots, pictures, CAT scans, bottom line is the only way to correct his condition is through surgery which caller stated he is not going to do that. After the 2 episodes, the convulsions and stomach calmed down but left damage to 2nd and 3rd vertebrae on right side. Since these events happened he has been going through hell with trying to get extended disability, denying it, has gone to every doctor. Patient has gone through shots, physical therapy, exercise, orthopedic surgeon said nothing else he can do, only thing that will correct this is surgery on the 2nd and 3rd but he is going to be 66 years old in December so he stated there is no way he is getting back surgery. Still in pain, back is not functioning the way should, trying to get disability, can't work or be up mobile for an 8 hour period.  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.