food made me nauseous; very fatigued; little sick" at 1st/he got sick 10 days after having his 2nd dose; trouble eating; sleeping a lot; Fever got as high as 101; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team for a Pfizer sponsored program (159558). The reporter is the patient. A 66 year-old male patient received bnt162b2 (COMIRNATY), administered in arm right, administration date 14Sep2021 (Batch/Lot number: unknown) at the age of 66 years as dose 2, single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Comirnaty (Dose 1 in left arm (lot no: unknown)), administration date: 2021, for COVID-19 immunization. The following information was reported: ILLNESS (non-serious) with onset Sep2021, outcome "recovering", described as "little sick" at 1st/he got sick 10 days after having his 2nd dose"; EATING DISORDER (non-serious) with onset Sep2021, outcome "recovering", described as "trouble eating"; SOMNOLENCE (non-serious) with onset Sep2021, outcome "recovering", described as "sleeping a lot"; PYREXIA (non-serious) with onset Sep2021, outcome "recovering", described as "Fever got as high as 101"; NAUSEA (non-serious) with onset 24Sep2021, outcome "recovering", described as "food made me nauseous"; FATIGUE (non-serious) with onset Sep2021, outcome "recovering", described as "very fatigued". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of illness, eating disorder, somnolence, pyrexia, nausea, fatigue.  Additional information: The expiry date for the Dose 1 and Dose 2 was unknown. The patient took Pfizer Covid 19 vaccine since delta variant got him worried. The patient was not taking any other products. The patient stated that he got sick 10 days after having his second dose of the Pfizer COVID Vaccine. He started getting a little sick at first. He states 10 days later just boom. He got very sick; fever got as high as 101. He contacted a friend of his that had COVID and spoke with him about his symptoms he was experiencing. He states this was on Friday the 24Sep2021 by that Sunday night "food made me nauseous. He states I guess by Monday or Tuesday he was again not feeling well, very fatigued, sleeping a lot, and trouble eating. By Saturday 8 days after initially getting sick he reports getting sick all over again, very bad sick he added. Fever, the whole bit that was 2 days ago. Today at this point I feel pretty good. I feel a lot better, not normal. His concern was also that he got a laboratory test on Friday and got some home tests, and they all tested negative. The caller states that he thought he had a breakthrough case of COVID-19 and that would have explained itself he states but since his tests were negative, he is unsure of what may be causing these symptoms within this time frame. He again states I got really sick and the caller notes that he was surprised I got so sick, and then I got so sick so late after having 2nd dose, then 8 days all over again. The caller would like to know if we have reports of this. Wanted to know if this has been reported where people get sick, get better and get sick again.   Follow-up attempts completed. No further information is expected.