chills; stomach problems/ stomach pains; back problems; weakness/low energy; sore arm for a couple of days; aching; upset stomach; lost weights; nasal drip; feeling "miserable"; he was really not well; diarrhea; sick/artificial sickness; This is a spontaneous report from a Pfizer-sponsored program. An 88-year-old male patient received his first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot number ER9231), via an unspecified route of administration on left arm on 08Jan2021 at single dose for COVID-19 immunization. Medical history included blood pressure high, diabetic and chronic obstructive pulmonary disease (COPD), he had started no new medications and not had any other recent vaccinations. He took a lot of medications for a lot of things. He was diabetic, had high blood pressure, COPD, a variety of things get over the years, he took medication for these things. He was affected by medications more than most people. No further details provided about his medications. He reacted to medications in general and that because of that he usually took lower dosages. The patient's concomitant medications were not reported. After 2 weeks from the vaccine. Have weakness and stomach pains and diarrhea. The patient had been artificially sick like 4-5 days since 21Jan2021, and had a test done and it didn't show up. He said he hadn't been anywhere to get the virus. He said he didn't have any fever, his oxygen level hadn't changed, he had a testing kit with thermometers, so he knew he never had a fever, but he got chills. He got all the symptoms, the stomach problems, diarrhea, back problems, overall weakness and low energy. He was fine two weeks before this, this started almost two weeks to the day and minute from when he went and got the shot. When he got the shot he had nothing, he waited 15-20 minutes with no problems, his arm was hurting for a couple days, but there was nothing else. Two weeks later he got basically an artificial case and the corona virus test said no, clarified to being negative, but he said it didn't go away, it had been from Thursday to Monday, so 5 days. The big problem was he was supposed to get his second shot Friday, and he had an appointment Wednesday, he would like to ask them too, but he would like to know was it dangerous for him to get the second shot. He didn't think he can get any sicker. He did not do a report online, he tried to get onto the website but nothing told him how to do it or whatever, so he stayed on the line waiting to talk to someone. Height: he was five feet and nine and three quarters inches tall, he had shrunk with age, everyone got smaller. His arm was not sore for very much, he didn't remember how long, he got sick two weeks later, and now he was really not well, though he was better than he was on Thursday or Friday, though he was not 100% yet. He would like to know if he should get the second shot, because he was too old to die from a corona virus shot. Investigations: He didn't know which COVID test they used, they did an instant test with results in an hour. The patient inquiry if he should get the second shot since he had had this artificial sickness for 5-7 days, two weeks after getting the vaccine. He had "sore arm for a couple of days" after the 1st injection, but "nothing more". However, in the last 4-5 days, he's been feeling "miserable". He didn't have fever. But he's been experiencing aching, diarrhea, upset stomach, lost weights and nasal drip. He tested negative to the COVID virus. He has a doctor's appointment scheduled this Wednesday. The outcome of events was unknown.