hot flashed; diarrhea; stomach cramps; weakness; tiredness; The cold chills lasted three hours; dizzy; shortness of breath; heartrate over 100; anxiety; exhausted; sore arm; This is a spontaneous report from a contactable consumer (patient) via medical information team.  A 61-year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation solution for injection, Batch/Lot number: EN6206), via unspecified route of administration on 12Mar2021 13:00 as a dose 1, single for COVID-19 immunization. Patient had medical history of high blood pressure, heart issues and diabetes (Diagnosed 5 years ago). Patient historical vaccines included flu shot and the second day after a flu vaccine, he gets cold symptoms, fever but not really bad. Patient usually gets a little reaction the next day. Patient concomitant medication includes furosemide, lisinopril, metformin, glipizide. Patient stated that he took was regular medicine including this medication. Patient had not received any prior Vaccinations within 4 weeks of vaccination. Patient received first dose of Pfizer BioNTech Covid vaccine on 12Mar2021. Twenty three hours later on 13Mar2021, he started having severe cold chills like he's never had before. The cold chills lasted three hours. Almost 3.5 hours. He felt dizzy on 13Mar2021 going to the bathroom and going back to the living room. On 13Mar2021 he experienced some shortness of breath and heart racing but he says it may have been due to severe anxiety on 13Mar2021. He checked his pulse ox of 89, and heart rate of 99. He called 911 and the fire department came to monitor him and they said he looked okay. He stated that after three and a half hours, on 14Mar2021 he experienced hot flashed and chills on and off and had some diarrhea on 14Mar2021 that night. The next day after vaccination on 14Mar2021 he experienced weakness, tiredness and stomach cramps. He also had a sore arm on unspecified date in Mar2021. He didn't take his ibuprofen the night before and switched to taking tylenol that morning. After the vaccine he took ibuprofen for the arm pain. Patient queried for whether the side effects from the second dose be better, worse, or the same than the first dose. He really wants to get the vaccine but doesn't know if he can handle the side effects again. Patient stated that he was calling about the Pfizer Covid19 Vaccine. He states that he was told that he needed to report his side effects with first shot and he would like to get information on the second shot, could it be worse than the first. Patient stated that after the first vaccine, he really didn't have any side effects until twenty-three hours after the shot. He states he woke up the next day and had breakfast and was feeling decent, then he started with cold chills, states this wasn't regular cold chills, it was shaking to bone cold chills for 3-3.5 hours. He states he started having anxiety because he didn't realize it was going to be going on that long. He states he also had dizziness and went to bathroom and back and by the time he got back to his lounge chair he was almost short of breath and experienced shortness of breath. After the cold chills went away, he states that he got a little warm after that. He states 4-5 hours later, he started feeling better and his cold chills stopped. Patient further stated that, the next day on 14Mar2021 he had diarrhea and felt really tired and exhausted. States that on Monday evening/afternoon he was feeling better. Patient reported that that he did call 911 because his heart rate was over 100. States he doesn't know if that was from the anxiety or not. States the paramedics told him that was part of it. States that his sugar level was 350, he was a diabetic, and that was a little high for him for sure. States that he wants to take the second shot, if it is not going to be any worse, he can get through what he went though. States but if he was going to feel worse or have chills for 6.5 hours, he was going to have a difficult time taking the second shot. He wants to be assured that the second shot won't be worse. He states that he took some Ibuprofen and his regular meds, his diabetes medication, Furosemide, Lisinopril and heart medicine. Patient had not attended any Emergency Room and Physician Office. states he called 911 and the Fire Department came out and did an assessment. He states he called because of the shortness of breath after going to the bathroom. States he recovered after he was back in the chair. States his heart rate was over 100 and his oxygen was 89 at one point. States the fire department states that it looked to be side effects from the vaccine. States they said they could take him to the hospital, but the hospital couldnt do anything for him. Outcome of events The cold chills lasted three hours, dizzy, shortness of breath, heartrate over 100, anxiety recovered on 13Mar2021, diarrhea, stomach cramps, weakness recovered on 14Mar2021, tiredness, recovered on 15Mar2021, exhausted recovered on unspecified date in 2021, hot flashed, sore arm was unknown.  No follow-up attempts are needed. No further information is expected.