had really low energy; tired; lethargic; terrible cramps; very cold sweat; diarrhea; Belly ache; bloody stools; broke into a sweat; Dull ache in stomach; Tried to move his bowels 2-3 times/No more bowel movements; soreness; soreness was in right arm; started having dark thoughts; had not eaten much/Had coffee this morning and he barely touched it yesterday morning; did pass gas and that was all that happened; This is a spontaneous report from a contactable consumer (the patient). A 73-year-old male patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot number EN6204), via an unspecified route of administration in the right arm on 04Mar2021 11:15 (at the age of 73-years-old), at 0.3 mL (30 mcg), single dose for COVID-19 immunization. The patient's medical history included: service connected disability diagnosed from the (name withheld) for a lower back injury; last Spring and early Summer (2020) he went through treatment for 45 days with External beam radiation therapy (EBRT), which was 405 doses of radiation from a machine called FORD, had radiation treatment for early stage prostate cancer last year (2020);  had anaphylactic shock, rash, awful case of hives when in military service in response to shots then and stayed for half an hour until okay (The patient was unable to provide names of vaccines given in past in service since that was in 1969-1970's. At that time, they got the shots in big air guns and was shot 3-4 at a time. Had those 3-4 shots during his basic training. During that time, he woke up around midnight and had awful case of hives and was taken to the base hospital and was given adrenaline in one arm and diphenhydramine hydrochloride (BENADRYL) in the other); allergies to sulfa drugs; diagnosed allergies (unspecified); compromised immune status; respiratory illness; genetic/chromosomal abnormalities; endocrine abnormalities (including diabetes and obesity); blood stools, rare occasion; glasses. Prior to the vaccination, the patient was not diagnosed with COVID-19. The patient had no concomitant medications. The patient did not receive any other vaccines within four weeks prior to the vaccination or on the same day as the vaccination. The patient received the first dose on 04Mar2021 at about 11:15. He had not had much of a reaction, just a little soreness and soreness (04Mar2021). The soreness started that afternoon of getting the vaccine. When he went to sleep, he noticed the soreness was in right arm, so he didn't lay on that side. He noticed it enough to sleep on the other side. On 07Mar2021, the patient had bloody stools, which were a rare occasion in the past. The patient stated the blood was significant enough to draw his attention, almost felt like a blockage in the system. The patient "sat on the pot" for 15-20 minutes and broke into a sweat (07Mar2021). The patient did not know if he had bloody stool then, because he didn't turn on the light, but ever since then, it has been bloody. No BM's (bowel movement) since yesterday (09Mar2021). The patient was tired yesterday (09Mar2021). He just laid around all day on a heating pad. He had a dull ache in stomach since it started (07Mar2021). Still there today, but not that bad. The patient stated he had radiation treatment for early stage prostate cancer, they tried to prevent burning or damaging the rectum, but this could be related to that. On Sunday night (07Mar2021), about midnight, he got an awful, awful stomach pain that woke him up about midnight. He tried to move his bowels 2-3 times Sunday night (07Mar2021) and on Monday morning (08Mar2021) he was able to move them a little bit. His underwear he had from Sunday night had lots of red stains in them, and all day Monday (08Mar2021) he was having a bellyache. Every time he managed to move his bowels and it was bloody and seemed to get bloodier pretty much all day. Yesterday (09Mar2021), he laid on a heating pad and went to bed early about 20:30, he usually goes about 22:00. He managed to stay in bed for about 9 hours, and he usually can't sleep that long. He slept on his side. He started having dark thoughts (unspecified date Mar2021), stating that last Spring and early Summer he went through treatment for 45 days with external beam radiation therapy (EBRT). On Monday night (08Mar2021), the patient had terrible cramps about midnight, with very cold sweat and diarrhea. The next morning (09Mar2021), every bowel movement was very bloody. Then all day Tuesday (09Mar2021) very lethargic. No more bowel movements until the following Friday. The patient stated he felt like I was trying to pass a blood clot. The patient stated he seemed to have problems with bowels all day yesterday (09Mar2021) and was not much better; he had really low energy (09Mar2021). Today (10Mar2021), he seemed to feel better, but not much. He had not eaten much (Mar2021) and was hesitant to put food in his system, since his system was not functioning very well. The patient had not been seen by doctor or in an emergency room. His wife was a retired nurse, and they have discussed if he was not better, they were going to call his primary care provider and urologist. The patient had coffee this morning (10Mar2021), and he barely touched it yesterday morning. So far, no bloody discharge, no discharge or bowel movements today. Three to four times in the night he did pass gas (Mar2021), and that was all that happened. The patient knew side effects were rare with this (vaccine) and unsure if these side effects were something reported; this was certainly unusual for him. The clinical outcome of bloody stools, dull ache in stomach, had really low energy, terrible cramps, very cold sweat, diarrhea, tired, and lethargic was recovering. The outcome of belly ache, decreased appetite, and gas, was not recovered. The outcome of other events was unknown. It was also reported that since the vaccination, the patient had not been tested for COVID-19.