bad constipation; the worse headache he has ever had; States the headache was 1000 times more painful than his migraines; States the Headache made him feel nauseated; He reports weak limbs; feeling shaky; he was barely able to stand up; vomiting; the headache as a burning sensation; caller concerned about stroke; 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 31 year-old male patient received bnt162b2 (BNT162B2), administered in arm right, administration date 15Jul2021 15:00 (Lot number: FA7485) at the age of 31 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "COVID", start date: Mar2020 (unspecified if ongoing); "Migraines" (unspecified if ongoing), notes: does have history of frequent migraines due to a traumatic brain injury.; "Traumatic brain injury" (unspecified if ongoing). The patient took concomitant medications. Past drug history included: T dap, start date: 15Mar2021, stop date: 15Mar2021, reaction(s): "sore arm", notes: Tdap: unknown volume. lot number: 2EC5G, expiry: unknown, NDC: unknown. Given on 15Mar2021. Manufacturer: Glaxo Smith Kline.; Flu shot, start date: 15Mar2021, stop date: 15Mar2021, reaction(s): "sore arm", notes: Influenza 0.5ml single dose, lot number: XT4Z7, expiry: unknown, NDC: unknown, given on 15Mar2021. Manufacturer: Glaxo Smith Kline. The following information was reported: ANXIETY (non-serious) with onset 2021, outcome "unknown", described as "caller concerned about stroke"; HEADACHE (non-serious) with onset 25Jul2021, outcome "recovered" (25Jul2021), described as "the worse headache he has ever had"; PAIN (non-serious) with onset 25Jul2021, outcome "recovered" (25Jul2021), described as "States the headache was 1000 times more painful than his migraines"; BURNING SENSATION (non-serious) with onset Jul2021, outcome "recovered" (Jul2021), described as "the headache as a burning sensation"; NAUSEA (non-serious) with onset 25Jul2021, outcome "recovered" (25Jul2021), described as "States the Headache made him feel nauseated"; MUSCULAR WEAKNESS (non-serious) with onset 25Jul2021, outcome "recovered" (25Jul2021), described as "He reports weak limbs"; NERVOUSNESS (non-serious) with onset 25Jul2021, outcome "recovered" (25Jul2021), described as "feeling shaky"; DYSSTASIA (non-serious) with onset 25Jul2021, outcome "recovered" (25Jul2021), described as "he was barely able to stand up"; VOMITING (non-serious) with onset 25Jul2021, outcome "recovered" (25Jul2021), described as "vomiting"; CONSTIPATION (non-serious) with onset 26Jul2021, outcome "recovering", described as "bad constipation".  Additional information: Added he had a history of frequent migraines due to traumatic brain injury. Stated he was supposed to have his second dose soon. Patient clarified gender, caller states he was born a female , has female parts however he was transitioning to male and identifies himself as male gender. Concomitant Products included hormones (Start date: 15Mar2021 and stop date: Ongoing). Patient was on hormones when got the vaccine. Reporter never worked as healthcare professional, but was a caregiver for 8 years. The headache started at about 1AM or 2AM. The vomiting and nausea started about 3:30AM or 4AM. The whole ordeal last until about 5AM. Caller noticed the stuff with the limbs when hurling, so it started about 3:30AM or 4AM also. Caller was glad to get the vaccine. The hell with the side effect as long as they were not bad. Caller's mom had cancer last year and had 2 major surgeries to remove cancer from inside her cheek. Because of that caller's mom had radiation and her immune system is down. Caller did not want to bring COVID to mom. Caller stated also experienced some bad constipation after the vaccine. That started Monday night and lasted until Wednesday of this week. Caller clarified that constipation started on 26Jul2021 and lasted until 04Aug2021. Caller was still recovering from constipation. Time the vaccination was given: approximately 3:00PM. Anatomical Location of Administration of Pfizer vaccine considered as suspect: upper right arm. There are general practitioners and health all in the facility. Caller received it at their HCP's office. One of the nurses administered it. No emergency room visit or physician office visit. Prior Vaccinations (within 4 weeks): None. AE(s) following prior vaccinations: The only adverse reaction is a sore arm with vaccines, but did not have sore arm with COVID vaccine. Caller reports the reason they called was to make sure they did not have a stroke because the headache was horrible.  Follow-up attempts are completed. No further information is expected.