I woke up convulsing with chills, cold, shaking; I woke up convulsing with chills, cold, shaking/I have to use four blankets to warm up; I got hot and I took it off; I got cold again;; Shaking; Still nauseous; Headache; I am still dizzy; I got sick again this morning; I am still sick; it won't go away; I am so tired; sick; I took an Aspirin; I felt faint like I am about to fall forward; every time I get a COVID shot; I have the similar side effects;; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 54-year-old male patient received bnt162b2 omi xbb.1.5 (COMIRNATY (2023-2024 FORMULA)), on 25Sep2023 as dose 5 (booster), single (Batch/Lot number: unknown) at the age of 54 years, in right arm for covid-19 immunisation. The patient's relevant medical history was not reported. Concomitant medication(s) included: INFLUENZA taken for immunisation, on 22Sep2023 as dose number unknown, single; LANTUS; HUMALOG. Vaccination history included: bnt162b2, bnt162b2 omi ba.4-5 (Dose 4 (booster), single; LOT#: GJ5342), administration date: 01Oct2022, when the patient was 53-year-old, for COVID-19 immunization, reaction(s): "I felt faint like I am about to fall forward and the weird thing is it happens every time I get the shot"; bnt162b2 (Dose 3 (booster), single; Batch/lot number: 939902), administration date: 04Feb2021, when the patient was 52-year-old, for COVID-19 immunization, reaction(s): "I felt faint like I am about to fall forward and the weird thing is it happens every time I get the shot", "Interchange of vaccine products"; moderna vaccine (Dose 2, single; LOT#: 939902 (Captured as provided)), administration date: 07Sep2021, when the patient was 52-year-old, for COVID-19 immunization, reaction(s): "I felt faint like I am about to fall forward and the weird thing is it happens every time I get the shot"; moderna vaccine (Dose 1, single; LOT#: 011L20A), administration date: 06Jan2021, when the patient was 52-year-old, for COVID-19 immunization, reaction(s): "I felt faint like I am about to fall forward and the weird thing is it happens every time I get the shot". The following information was reported: HEADACHE (non-serious) with onset 26Sep2023, outcome "unknown"; DIZZINESS (non-serious) with onset 26Sep2023, outcome "unknown", described as "I am still dizzy"; SYNCOPE (medically significant) with onset 26Sep2023, outcome "unknown", described as "I felt faint like I am about to fall forward; every time I get a COVID shot; I have the similar side effects;"; ILLNESS (non-serious) with onset 26Sep2023, outcome "not recovered", described as "I got sick again this morning; I am still sick; it won't go away; I am so tired; sick; I took an Aspirin"; NAUSEA (non-serious) with onset 26Sep2023, outcome "not recovered", described as "Still nauseous"; CHILLS (non-serious) with onset 26Sep2023 at 03:15, outcome "unknown", described as "I woke up convulsing with chills, cold, shaking"; NASOPHARYNGITIS (non-serious) with onset 26Sep2023 at 03:15, outcome "recovered" (26Sep2023), described as "I woke up convulsing with chills, cold, shaking/I have to use four blankets to warm up; I got hot and I took it off; I got cold again;"; TREMOR (non-serious) with onset 26Sep2023 at 03:15, outcome "unknown", described as "Shaking". The patient underwent the following laboratory tests and procedures: Lab test: Unknown results, notes: Lab Test: Consumer stated, "No, I had labs done I think in July.". Therapeutic measures were taken as a result of syncope, chills, nasopharyngitis, tremor, nausea, headache, dizziness, illness.  Clinical course: Consumer stated, "12 hours later around 3:15 in the morning I woke up convulsing with chills, cold, shaking. I have to use four blankets to warm up and then around at 7, I got hot and I took it off and then around 7:30 I got cold again and I have been in bed all day covered with the three big heavy blankets and I am nauseous, I have headache, I am dizzy, I felt faint like I am about to fall forward and the weird thing is it happens every time I get the shot, every time I get a COVID shot. This is my fourth or fifth shot, the first two were Moderna (Moderna COVID-19 Vaccine) and, I had Pfizer but I have the similar side effects, so the last three I took Pfizer because they were out of Moderna, they were doing one of the other so they said either one would work, it is okay to mix them and I said okay, so I took it and I got sick again and again this morning I got sick again I forgot all about it but I took Aspirin (Later clarified as Baby Aspirin) and I am still sick, it won't go away." Treatment: Consumer stated, "I took an Aspirin, two in the morning 2:30 and then I took two about 8 in the morning and then I took one 4 that go long about 4 in the afternoon."  The information on the batch/lot number for bnt162b2 omi xbb.1.5 has been requested and will be submitted if and when received.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202300312096 Same patient/vaccine, different dose/event;US-PFIZER INC-202300312095 Same patient/vaccine, different dose/event;