cold sweat; headache; cramping/spasm; bumps on the side of neck; body aches; Bumps on his head that were also painful; stomach cramps; diarrhea; he threw up several times; nauseous; disorientated; just not feeling good at all; tired; neck pain; felt weird; This is a spontaneous report from a contactable consumer (patient). A 45-year-old male patient received first dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; /Lot Number: ER2613), via an unspecified route of administration, administered in right arm on 04Apr2021 (at the age of 45-years-old) at 14:00 as single dose for covid-19 immunisation. Medical history included COVID: he had gotten diagnosed with COVID back in December or January and twice tested positive for covid and his body had fought it off (as reported). Medical history included also back pain Concomitant medication included diphenhydramine hydrochloride (BENADRYL) taken to sleep, start and stop date were not reported. The patient reported that around the night of vaccination he experienced cold sweat, headache, and cramping for several hours then subside and come back later. Patient had some bumps appear on the side of his neck. He stated that he could not say that's from the shot, something may have bit him. The patient did bump his head a chandelier and went to the ER. He received Ibuprofen for the symptoms. Patient stated that the reported events occurred the same day as his COVID Vaccine and began a couple of hours later and wakes up every night in a cold sweat; stated he was in and out of the emergency room in about an hour and they gave him Ibuprofen  400mg and a of nights had to take two Ibuprofen because his head and body was hurting so bad and he had to take some kind of relief and he does not like taking stuff like that and pain pills make his stomach hurt. Patient stated he did a whole Ibuprofen and did not feel good after that and can't take the Ibuprofen anymore and then took 1-2 Aleve after that and does not like taking pain medication. He stated he was healing with the bumps but had this every day since the Pfizer Vaccine and he was starting to heal but the bumps were still there on the side of his neck and were improving and healing and he had the bumps on his head that were also painful; states the bumps occurred the same day as his Pfizer COVID Vaccine; states he was up in his attic and could have gotten into a spider nest and might have poison in him from the spiders and then went to the hospital emergency room with these issues. States he told the emergency room about the bites and bumps and that he had the Pfizer COVID Vaccine and they gave him the Ibuprofen and sent him home. The patient stated that this was a real concern for him due to the blood clots stuff coming out about how people have different reactions after a vaccine. States he felt like the hospital did not even do anything; he could have hit his head a couple of times on a chandelier; states the emergency took an image of his head and they did not address the bumps or anything else and said his head was not bleeding and gave him Ibuprofen and he did not think you should take Ibuprofen like when you have COVID and they sent him home and nothing was done. Caller states he does not know but when he received the Pfizer COVID vaccine he noticed a patch of bumps in his neck, and his neck got really tight and his neck still hurts on the left side; states he could have gotten bitten by something. The patient reported that after he had the Pfizer COVID vaccine, he was waking up every night with cold sweats, and recently last night had extreme cramps in his stomach area like was crawling around the floor getting away from the pain and is still having abdominal cramps. He ate a burger and had extreme cramps and diarrhea for days and this was after his Pfizer COVID vaccine and he is doing this again with stomach cramps and diarrhea; he can't distinguish what the cramps and diarrhea were from and maybe he ate something bad and is confused about his body; states the cramps are way worse and the diarrhea began after the burger. States the diarrhea is a lot and this time is less diarrhea but more abdominal cramps and he threw up several times last night and did not throw up a lot but was so nauseous and threw up twice a little bit. Patient stated that the reported events were just like when he had covid and after waking up at 12:00 he had body pains and was not able to go back to sleep until 4:00; states he had pretty bad headaches which are ongoing and had had headaches ever since he was diagnosed with COVID, stated it is the same thing also as when he had covid; states with covid he got sick and was up from 12:00 4:00 and had fatigue, had body pain, had headaches and nausea and then it got better and he started sleeping through the night. States the Pfizer COVID shot and it was like the same all over again where he was up from 12:00 4:00, had pain and was disorientated, just not feeling good at all which has gone on since the shot; states there were two nights where he slept through the night and was up in a cold sweat which wakes him up and drenches him head to toe and he has to get out of bed to change clothes and sit there til he is tired again and sometimes goes to sleep in the chair and then sleeps ok. Patient stated he took Benadryl just to sleep through the night and did not and got up once and then went back to sleep. He stated on the left side where the headaches were and he had neck pain and it was kind of the left side and felt weird. The patient stated also that in the emergency room he was given Valium in his arm and also has a knot on the back of his neck and tried to address it with the emergency room and they said it was a spasm and did not seem concerned and it felt hard and not a bump under his skin in his neck and it just felt like maybe a pea sized hard knot and noticed this after his Pfizer COVID Vaccine. Caller stated he actually felt pretty good and was sleeping through the night after he had COVID and felt back to normal and then after his Pfizer COVID vaccine everything went downhill. The outcome of events was unknown.   No follow-up attempts are needed. No further information is expected.