Terrible migraine type headaches; He was unresponsive. It looked like he was going into a seizure. His arms went stiff, his elbows locked, his shoulder went up and his head cocked back. He was out for almost a minute; very nauseous and almost threw up; Lost his hearing; He was unresponsive. It looked like he was going into a seizure. His arms went stiff, his elbows locked, his shoulder went up and his head cocked back. He was out for almost a minute; He was unresponsive. It looked like he was going into a seizure. His arms went stiff, his elbows locked, his shoulder went up and his head cocked back. He was out for almost a minute; Cold sweats; Light headed; Everything went foggy; Serious nausea; Feels like crap; Diarrhea; Had a major headache; Hasn't been able to sleep properly; This is a spontaneous report from a contactable consumer (patient). A 31-year-old male patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Lot Number: FE318, and Expiration date: Unknown), via an unspecified route of administration, administered in right arm on 09Aug2021 at 13:00 (at the age of 31-year-old) as Dose 1, Single for COVID-19 immunization, at pharmacy/Drug Store. The patient had no medical history and concomitant medications. The patient had no family medical history relevant to adverse event. No prior Vaccinations were administered within four weeks prior to the first administration date of the suspect vaccine. No adverse events following prior vaccination. No vaccine was administered on same date with the Pfizer vaccine. No previous immunization with the Pfizer vaccine. It was reported that the patient received his first dose of the COVID-19 vaccine (at CVS pharmacy) on 09Aug2021 and just 3 minutes after the vaccine (at 13:03) he started feeling "cold sweats", "light headed", "everything went foggy", and he "lost his hearing". He stood up to try and shake the feeling off and he did not want to pass out in his seat. He paced back and forth for about 10 seconds and could not shake the feeling. He looked at the nurse and told her he was not ok. The next thing he remembered was waking up with his head on the counter and "serious nausea". The nurse said to him she was panicking because she had been calling his name and "He was unresponsive. It looked like he was going into a seizure. His arms went stiff, his elbows locked, his shoulder went up and his head cocked back. He was out for almost a minute". After he woke up, he was "very nauseous and he almost threw up". He told the nurse he was not ok. He "feels like crap", he was nauseous. The nurse told him she had called an ambulance, but he told the nurse to cancel the ambulance because he could not afford the bill. He sat at the CVS pharmacy for about 45 minutes trying to shake the nausea. He ended up getting "diarrhea" while sitting there too. Another reaction besides the nausea for the whole day was he "had a major headache". He knew his side effects started at 3 minutes after the injection because the nurse had asked him to hang around for 10-15 minutes and he had gotten on his phone to check the time. When probing if his symptoms were still present "he states he does not feel great now but he does not feel as bad". The day after the COVID-19 vaccine he was having "terrible migraine type headaches". Ever since he received the COVID-19 vaccine he "hasn't been able to sleep properly" (from unspecified date in Aug2021) and he normally did not have trouble sleeping. He stated he did not have any medical conditions that he knows of. He stated the nurse at the CVS pharmacy told him she was going to write a report that would be sent to the CDC. He did not remember everything she said. He asked if this report was something similar. He was not given a report or reference number from the nurse. The patient was curious about his second COVID-19 vaccine and he was terrified of getting it. He was wondering about guidance on receiving the second dose given his side effects from the first dose. The patient did not want to go through that again. The patient did not seek medical attention after the events. He did not have a primary care doctor. His insurance was Tricare Prime. No relevant tests were done. No emergency room of physician office visit was done. No investigation assessment. The patient reported that he took vaccine as he is a student and his school had mandated the vaccine. The report was submitted as non-serious. The outcome of event "hasn't been able to sleep properly" was reported as not resolved. The outcome of other events was unknown.  Follow-up attempts are completed. No further information is expected.