slightly dizzy; pain in arm slightly; His head was still just a little foggy; Unrestful night; This is a spontaneous report from a contactable consumer (patient). A 89-years-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Lot Number: EN5318), dose 1 intramuscular, administered in arm right (Injected into right shoulder in the muscle) on 10Feb2021 09:50 to 10Feb2021 09:50 (at the age of 89-years-old) as single dose for prevention (COVID-19 immunisation). Medical history included ongoing AFib (Diagnosed 7-10 years ago), sulfa allergy, ongoing to keep bowels soft and pliable, down from 210 lbs (he found out his wife had breast cancer, he lost the weight, prior receiving vaccine), bad ankles (uses a cane and walker and noticed he was having). Concomitant medications included warfarin at 5 mg daily (Started taking 7-10 years) for AFib; diltiazem hydrochloride at 180 mg daily (Started taking 2 years ago) for AFib and omeprazole at 20 mg daily (Taking for 7-10 years) to keep bowels soft and pliable and unspecified medication. They reported that he called Pfizer yesterday about the same question; however, today he would like to know if he can get a letter stating that it was permissible to get the vaccine 4 days short of the 21 days. Caller reports that he received first dose yesterday, and felt slightly dizzy afterwards and today he had pain in arm slightly Feb2021. Caller reports he had a sulfa allergy. Caller was scheduled for second dose on 27Feb2021. He received the first shot this morning. It went along nicely. He had two questions. He went back in to reschedule next appointment and the only thing they had available at (College name) was this month on 26Feb2021 or 27Feb2021, so he picked out the 25Feb2021, which he later stated was 26Feb2021. He had the shot this morning and it was only 15 days and he understands it was not supposed to be given until 21 days and wanted to know if that was true. His second question was after he had injection and he told them he was only allergic to Sulfa, they told him not to worry about it that there were so little problems with that. Before he got it, he had a sleepless night. He said he was old and he was worried about all kinds of things. He started talking to the guy the drove him over. He noticed he was a little dizzy and he probably could drive but should not. They dropped him off at his place and he was only one block away. When he got home, he drank some water and ate lunch and still feels a little bit out of it. He had a feeling if he got a good nights sleep, he would be fine. But, he wondered if it was related to the Sulfa allergy. He was down from 210 lbs. It just happened when he found out his wife had breast cancer that he lost the weight, which was prior to receiving the vaccine. She just passed away 6 weeks ago and had bone and breast cancer. He was bending and his back was starting to arch. He used to be 5' 11.5". That was before the vaccine. This has been happening for years. He has bad ankles and uses a cane and walker and noticed he was having more trouble right after he got the vaccine. Now, he was not having any more problems than usual. His head was still just a little foggy on 2021. When getting up, he stated he did not fall. He had a very unrestful night on 2021 and it could be related to that. He heard second dose should be 21 days and not 15 days. He provided on his vaccine card. They were having an influx of cases in his area and his wife and he had planned to get the vaccine as soon as they offered it. He said the reason he takes Omeprazole was his insides, all through his hose system, every once in a while he had some problems, and it started to bleed, so this was something to keep it soft and pliable. He was allergic to Sulfa. He does not have the name of medication, manufacturer, lot or expiration. The outcome of event slightly dizzy was recovering and other events was unknown.