flu; felt like he was back having the COVID-19 virus all over again; Urine was a bright yellow color; soaking wet sweating; fever of 101; tiredness; headaches; chills; He slept the whole day; joints; shortness of breath; weakness; lower back was hurting; This is a spontaneous report from a contactable consumer (patient) via Medical Information Team. A 71-year-old male patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/ Lot number: On CDC vaccine record card reporter thinks Lot is EN6206, pretty sure but could be EV6206) (pending for clarification), via an unspecified route of administration on 15Mar2021 (reported as Monday) (at the age of 71-year-old) at around13:00-13:30, at a single dose for COVID-19 immunization in clinic. Patient had a history of COVID-19 virus around onset about the last day of Sep2020 or Oct2020.Down and out for about 14 days before totally turned it around (when he had COVID-19 virus they turned him away from his normal doctor and told him to go get tested on his own so the whole process was handled through emergency urgent care testing) and had a blood disorder, does get blood clotting. The patient had no relevant concomitant products or other medical conditions. Nothing relevant; he has just been taking the medicines he has always taken; mostly a lot of vitamins and stuff and he takes a full acetylsalicylic acid (ASPIRIN). Patient had his last blood work and testing done in Oct2020 when they gave him clearance, told him he was no longer positive for COVID-19 virus, no bloodwork taken since then. Patient had undergone height measurement and resulted as 5 feet, 9 inches, probably 5 feet, 8 inches because he shrunk getting older but thinks 5 feet, 9 inches. Patient had no exposure that he was aware of other than his own history of COVID-19. He went and asked if he should get the Pfizer-BioNTech COVID-19 Vaccine and was told yes because it was over 90 days since he was cleared of COVID-19. On 15Mar2021, patient had some issues with first shot. After his vaccine by the end of the day he felt like he was back having the COVID-19 virus all over again and had all the symptoms he had before, like weakness, shortness of breath and everything. He stated he was really got effected at the end of the evening but did not know until the following morning when he woke up and was soaking wet sweating and had a fever of 101. He slept the whole day and by the end of the second day he felt much better but still had a fever. He sweat that evening and the next morning felt good again. This all lasted a total of maybe 24 hours until he felt good again. He had something different after the Pfizer-BioNTech COVID-19 Vaccine that he did not have when he had COVID-19 virus which was his urine was a bright yellow color from 16Mar2021 to 17Mar2021. His urine looks normal again today (18Mar2021), but he did not have urine symptom when he had COVID-19 virus previously. Patient reported that he had the flu on an unspecified date. He asked because he is slated for the second dose of the Pfizer-BioNTech COVID-19 Vaccine on 08Apr2021, he stated he knows the first shot was supposed to give him 50 percent immunity, he does not think he should go do it again, it makes him real nervous about the results he had from the first dose of Pfizer-BioNTech COVID-19 Vaccine; asked if he should or should not get the second dose relative to these events. Everyone else said it was a piece of cake, but it wasn't for him. He was ok all day after the Pfizer-BioNTech COVID-19 Vaccine was administered 15Mar2021, felt pretty decent the rest of the day and evening. On 16Mar2021 his whole world changed, felt like he was back having the COVID-19 virus all over again starting 16Mar2021 he had exactly all the same things, feeling like he had before, that he experienced when he had COVID-19. He woke in the middle of the night with sweats, really hot-his wife took his body temperature, and his body temperature was 101; he slept most of the day on 16Mar2021. He had tiredness; headaches; chills; joints; fevers; the whole thing for about a 24 hour period until event finally subsided, clarified as improved the patient was started feeling a little better 16Mar2021, but he sweat like crazy that evening so that must have broken the fever. It was not until morning of 17Mar2021 that he felt functional. He still once in a while gets a little headache but that is minor. The only thing was on the second day after the first dose of the Pfizer-BioNTech COVID-19 Vaccine was administered, after events onset, patient received a couple of Aspirin because his lower back was hurting, probably from sitting so long. The reporter assessed the events as non serious. The outcome of the events urine was a bright yellow color was recovered on 18Mar2021, lower back was hurting was unknown and the rest of the events was recovering.  No follow-up attempts are possible; information about lot/batch number cannot be obtained.