High pulse rate; Blood pressure low; Sweating; Clammy; wasn't feeling well; Chills; feeling feverish without having a fever; Fatigue/Tiredness; irregular heartbeat; he said the nausea started later on Friday evening; he had a sore right arm after getting the COVID-19 Vaccine; He said he already has stomach trouble; pain in his chest.; This is a spontaneous report from a contactable consumer (patient).  A 73-year-old male patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, lot number: EJ1686, expiry date not reported), via an unspecified route of administration in the right arm on 29Jan2021 at single dose for COVID-19 immunization. The patient was vaccinated at a hospital. Medical history included heart rate irregular and blood pressure high. Concomitant medications were none. The patient said he had an irregular heartbeat after getting his first dose of the COVID-19 Vaccine on Friday, 29Jan2021. He said he had to go to the Emergency Room on Sunday, 31Jan2021. He clarified he checked his blood pressure at home and his blood pressure was low at 91/73. He said he also had a high pulse rate of 160, or better, for 9-1/2 hours. He said the only thing he can attribute his low blood pressure and high pulse rate to is the COVID-19 Vaccine. He said he hasn't heard anything about the COVID-19 Vaccine being related to having an effect on the heart, but he personally believes it was his first COVID-19 Vaccine dose that caused his low blood pressure and high pulse rate. He clarified after receiving the COVID-19 Vaccine on Friday, 29Jan2021, he had a sore right arm after getting the COVID-19 vaccine, fatigue, tiredness, and nausea. He said on Saturday, 30Jan2021, he wasn't feeling well. He said he recognized a small amount of chills, feeling feverish without having a fever, and sweating. He said his wife checked his temperature a few times on Saturday, 30Jan2021, and he never had a fever, but he felt clammy. He said he had noticed the nausea more than anything else. He said he maybe should have checked his blood pressure on Saturday, 30Jan2021. He said he didn't check his blood pressure until Sunday morning, 31Jan2021, and when he saw his low blood pressure and high pulse rate, he called the hospital and eventually drove to the Emergency Room. He said by the time he had got to the Emergency Room his blood pressure had went up to "100 and something", but his pulse rate never changed, and his pulse was still 160. He said the doctor gave him several medications to try to get his pulse rate to come down. He said the doctor had given him a medication that was supposed to bring his pulse down. He said then the doctor had to add something else in a syringe to go with the other medication to bring his pulse down. He said he wasn't sure of the medication's name. He clarified he never noticed his pulse rate was high until he took his blood pressure on Sunday, 31Jan2021. He said he felt the nausea start later Friday evening (29Jan2021). He said he already has stomach trouble anyways that he takes medicine for, so he took a pill, but the nausea continued. He clarified he took 1 Omeprazole 20mg capsule that was dispensed in a pharmacy bottle, but stated the Omeprazole 20mg prescription looked like it expired in 2017. He said he knows he has a newer Omeprazole prescription, but did not know where the prescription bottle was. He reported on Saturday, 30Jan2021, he just laid around. He said he did not feel as bad on Saturday, as he did on Sunday, 31Jan2021. He said he called the Emergency Room on Sunday morning, and went to the Emergency Room. He said he didn't feel his 160 pulse rate. He said he was told by the doctor in the Emergency Room that his fast heart rate had his heart beating like he was having a stress test. He reported he doesn't know if he wants to get the second COVID-19 Vaccine shot after what he experienced this past weekend. He reported he only takes blood pressure medicine that he has  been on for a while. He reported he had several EKGs done on Sunday, 31Jan2021, while he was in the Emergency Room. He said the EKG showed Atrial Fibrillation/flutter with a heart rate in the 160s. He reported while he was in the Emergency Room he was given IV Heparin, IV Potassium, Potassium pills, and Amiodarone in a pill and IV form. He said the doctor added another IV medicine in a syringe, but he doesn't know the name of the medicine. He said the doctor also gave him IV Morphine because he had pain in his chest. He said the doctor said his chest pain was being caused by his heart trying to go back into a regular rhythm.  He reported he was in the Emergency Room for 11-12 hours before he was admitted to the hospital. He said his pulse rate wasn't coming down and stayed at 160 for 9-1/2 hours. He said the doctor wanted to admit him to the hospital, so he could have a procedure to make sure the high pulse rate didn't damage his heart. He said on Monday, 01Feb2021, he had a procedure where they went through his wrist and put a dye in his heart to see if the stress from his high pulse rate damaged his heart. He said his heart wasn't damaged, so he was discharged from the hospital later in the day on 01Feb2021. He clarified his blood pressure was good by the time the first or second EKG was performed in the Emergency Room. He clarified he already had an issue with sweating before he received his first dose of the COVID-19 Vaccine. He said he is still sweating, but he doesn't know if that is because of the COVID-19 vaccine. Clinical outcome of high pulse rate and blood pressure low was recovered on 31Jan2021; nausea, fatigue/tiredness recovered on 02Feb2021; chills, feeling feverish recovered on an unspecified date; sweating was not recovered; while for the other events was unknown.