This is a spontaneous report from a contactable consumer (patient). A 74-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE) via an unspecified route of administration, administered in Arm Left on 18Mar2021 10:30 (Lot Number: ER2613) as 2ND DOSE, SINGLE for covid-19 immunisation. Medical history included supraventricular tachycardia from Dec2020 and ongoing; ongoing blood pressure high; she was diagnosed with high blood pressure post pregnancy. She said the last 6 weeks of her pregnancy she had toxemia. Her blood pressure was up, then went back down, and then shot back up. She experienced tachycardia at the time too. She took atenolol for 46 years for her high blood pressure. She was confident she had the COVID-19 Virus in Jan2020 before anyone knew about the pandemic. She and her husband got the COVID-19 vaccine so they could visit family, whose son was diagnosed with multiple myeloma. They were planning to go in Jun2021 for a visit, and her husband's family wouldn't let them visit unless both of them had the COVID-19 vaccine. No additional vaccines administered on same date of the Pfizer suspect. No Prior Vaccinations within 4 weeks. Concomitant medications included in the morning of 18Mar2021 she took atenolol 25 mg tablet that was dispensed in a pharmacy. She regularly took atenolol 25 mg, twice a day. She also took olmesartan 5 mg (NDC Number: 16729-320-15, Lot Number: M2015864, Expiration Date: Oct2022). She regularly took olmesartan 5 mg, twice a day. She clarified 4 days after her second COVID-19 Vaccine, her cardiologist's Nurse Practitioner increased her olmesartan dose from 5 mg twice a day to olmesartan 10 mg, twice a day. The increased Olmesartan dosage gave her a monstrous headache. The cardiologist's nurse practitioner told her she would also need a blood test to make sure the olmesartan increased dose wasn't affecting her kidneys. Her primary care doctor asked how she was tolerating the increased olmesartan dose. She told her doctor she wasn't happy that the olmesartan could affect her kidneys and the headaches were killers. Her doctor told her that headaches were a side effect of olmesartan. She stayed on the increased olmesartan dosage for 3 weeks before her primary care doctor decreased her olmesartan dose back to 5 mg, twice a day on 17Apr2021. She said she had to go back to her doctor on 17May2021 for a follow-up appointment. She said her headaches were not as frequent since she reduced the olmesartan dose to 5 mg, twice a day. She still had headaches in the morning, and headaches at night, but was OK during the day. She treated her headaches with a cold cloth on her forehead. She said if her headache was extreme, she would take generic acetaminophen 500 mg caplet (100 caplets/bottle, NDC Number: 36800-484-78, Lot Number: GE2569C, Expiration Date: Apr2022) a couple times. She had to use a magnifying glass to read the Acetaminophen 500 mg caplet product label as the type was very tiny of the product label, and she was using reading glasses. She took regularly hydrochlorothiazide, triamterene (TRIAMTERENE/HCTZ, manufacturer Lannett) 37.5 mg/25 mg tablet, once a day. Primary care doctor kept her on regular visits to monitor her blood pressure. The patient previously received first dose of BNT162B2 (Lot Number: EN6205) Intramuscular in her left arm on 25Feb2021 had no reaction to the first COVID-19 Vaccine. She said within 30 minutes after getting the second COVID-19 Vaccine on 18Mar2021, her heart was racing. Her heart felt like it was fluttering in her chest. She said she felt very hot and was not comfortable. She said in the car, on the way home from getting her second COVID-19 Vaccine, her husband wanted to take her to the Emergency Room. She said she didn't feel it was critical, and her heart racing felt like the tachycardia she had experienced in the past. She said she called the COVID-19 Vaccination facility when she got home. She said she was told by them to lay down and rest for a while to see if that helped, and if she had chest pain or wasn't feeling better, to go to the Emergency Room. She said she went to bed, and laid down at their suggestion, and it took about 48 hours for her heart rate to settle down completely. She clarified when she first checked her heart rate, her heart rate was 116. She said prior to the COVID-19 Vaccine, her normal resting heart rate was 58, and now her resting heart rate is around 66. She said her blood pressure went out of control, too, and she had not been able to get her blood pressure under control since. She said she checked her blood pressure when she got home from her second COVID-19 Vaccine. She said her blood pressure would go up and then come down. She said the highest blood pressure reading she experienced (after getting her second COVID-19 Vaccine) was 201/116, and her lowest blood pressure reading (since then) was 152/96. She said her blood pressure at 11:00 PM last night (29Apr2021) was 168/93. She said prior to getting the COVID-19 Vaccine, her blood pressure averaged 139/83 with her lowest reading being 121/79. She said now her blood pressure readings average between 155-165/80s. She said her primary care doctor, and her cardiologist were in touch with each other about her medications. She said she breezed through her first COVID-19 Vaccine, but the second COVID-19 Vaccine had took a toll on her. She said from 2021 she had no energy and couldn't get out of her own way now. She said she was not the typical 75-year-old. She said she didn't retire until she was 70-year-old and was very active up until the time she received her second COVID-19 Vaccine. The events require a visit to physician office. She didn't take any over-the-counter or prescription medications for Heart Racing, but went to bed, laid down, and rested. She was very cautious about taking over-the-counter medications with her prescription medications. She said she tried to limit taking over-the-counter medications because she thought it was safer to do so. She checked her blood pressure when she got home from her second COVID-19 Vaccine. She said she had been tracking and checking her blood pressure, and took her blood pressure readings to her primary care doctor. She said her doctor made a copy of her blood pressure readings and put the blood pressure readings in her medical file. She said her blood pressure would go up and then come down. She said the highest blood pressure reading she experienced (after getting her second COVID-19 Vaccine) was 201/116, and her lowest blood pressure reading (since then) was 152/96. She said her blood pressure at 11:00 PM last night (29Apr2021) was 168/93. She said prior to getting the COVID-19 Vaccine, her blood pressure averaged 139/83 with her lowest reading being 121/79. She said now her blood pressure readings average between 155-165/80s. She didn't take any medication specifically to treat the high blood pressure after the second COVID-19 Vaccine. She had already took her regular medications that morning (18Mar2021) before she went for the COVID-19 Vaccine. The outcome of event her heart was racing, her heart felt like it was fluttering in her chest, felt very hot, she was not comfortable was recovered in Mar2021, of event she had not been able to get her blood pressure under control was not recovered, of events had no energy and tachycardia was unknown.