Felt kind of nauseated/ nausea; Could not think/his mind was blank/ couldn't think to do anything; felt like he was in slow motion; This is a spontaneous report from a contactable consumer (patient). This 65-year-old male patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE), via an unspecified route of administration, administered in left arm on 22Mar2021 probably around noon (at age of 65 years old; lot number: ER8730) as single dose for COVID-19 immunization. Medical history included high blood pressure diagnosed about 10 years ago and diabetes type 2 diagnosed about 10 years ago (as of 24Mar2021). He caught COVID a few months ago (as of 24Mar2021) and was sick for 3 weeks and then came out of that and at that time got a rash and came out of that and wanted to get the vaccine because he was age 65 and did not want this thing to kill him. Concomitant medication(s) included gabapentin 300mg, 1 capsule three times per day by mouth, taken for neuropathy in his hands and his hands hurt from 22Mar2021 and ongoing. He was given the gabapentin to stop his hands from hurting. He also had medications he took every day and had diabetes type 2, and also had high blood pressure that he took medication for. No additional vaccines were administered on same date of the Pfizer suspect. There were no prior vaccinations within 4 weeks of the Pfizer vaccine. The patient reported he saw his healthcare professional (HCP) for the first time the same day he got the Pfizer Vaccine on 22Mar2021 and saw the HCP that morning. When he left he felt fine that day 22Mar2021 and felt fine that night. That night he tore up his bedroom and cleaned it and felt fine. Then the next morning (23Mar2021) he went to work and felt fine for a while and then got to building. He started working and then felt like he was in slow motion and couldn't think and it was crazy and his mind was blank and he could not think and felt like he was in slow motion; couldn't think to do anything. The feeling like he was in slow motion and not being able to think began yesterday morning on 23Mar2021 and stopped yesterday 23Mar2021 also. Yesterday he came home because he runs saws at work and stuff like that and he couldn't think and couldn't be around stuff like that because he was cutting things and could get hurt. He had not had this happen before and the feeling as if he couldn't think and felt in slow motion was not ongoing today, 24Mar2021. Today he now has nausea and the nausea was ongoing and about the same as when it began. Also stated as today (24Mar2021) he felt kind of nauseated and couldn't do anything again today and thought he would stay home because of these small side effects of the vaccine that he wanted to report. He had no treatment for the reported events but just went home and laid down. The events did not require an emergency room visit. Regarding whether the events required a visit to physician office the patient replied "Yes", he saw his HCP the morning of the day he got the vaccine on 22Mar2021. Patient was going to call the HCP to see if the medication she gave him would have these side effects and he had not taken the Gabapentin before; stated the HCP issued him Gabapentin that he began taking on 22Mar2021. He was calling the HCP to see if the reported events were related to the gabapentin as he had not taken that before. "Feeling like he was in slow motion and not being able to think" was recovered on 23Mar2021 and patient had not recovered from nauseated.