heart was fluttering and beating out of her chest; Elevated heart rate/The highest was 130; she felt her heart racing; Heart rate goes up and down; could not do anything and was laying in bed or on the couch; white blood cell count is higher than it should be; has allergies to medications but not what was in the Pfizer shot. She adds that maybe she had a reaction to the chemicals in there.; This is a spontaneous report from a contactable consumer (patient, self-reported). A 62-year-old female patient received first dose of BNT162B2 (PFIZER-BIONTEC COVID-19 mRNA VACCINE, solution for injection, lot number: EN6206 and expiry date: was not provided), via an unspecified route of administration, in arm left, on 10Mar2021 at 03:30 PM, as a single dose for COVID-19 immunization, at hospital. The patient was not pregnant at the time of vaccination. The patient was tested for COVID-19, before the vaccination, however, results not provided. The patient has not been tested for COVID-19, after the vaccination. Patient's medical history included breast cancer survivor, chronic lymphatic leukemia. Patient had known allergies with penicillin and sulfa. Concomitant medications included calcium, colecalciferol (D3), macrogol 3350 (MIRALAX), multi vitamin, and ibuprofen (ADVIL DUAL). The patient previously took ciprofloxacin (CIPRO) and morphine: and had allergies with both drugs. The patient reported that on 11Mar2021, her heart was fluttering and beating it out of her chest with elevated heart rate which goes up and down. She also felt her heart was racing. It was very erratic. The highest heart rate was 130 (non-sustained). It was started since morning after the vaccination and was still happening now and wanted to know that it was a normal side effect. She had a cardiac work up and couldn't find anything however, everything was normal. Her heart rate went up to 130, 140, 150 and went to 80. This was happened over a period of 5 or 6 days. She felt like she could not do anything and was lying in bed or on the couch for three days. Her white blood cell count was higher that it should be. She went to her regular doctor who did the EKG, however, results not provided. Further, she went to a Cardiologist and they did another EKG and wore a monitor for a week and did echocardiogram and blood work all results were normal. She was wondering, if this could possibly be a side effect from the vaccine because it did occur in the morning after she got vaccinated. She also reported that she had allergies to medications but not what was in the vaccine and that maybe she had a reaction to the chemicals in the vaccine. She was supposed to get the second shot of vaccine which was scheduled on 31Mar2021 and had concerned about getting the second shot because she had some allergies and now this happened. She was very frightening and thought that she was going to die. It was very scary for her. The product complaint was not reported. The patient did not receive any treatment for the event. Outcome of the event Allergy to chemicals was unknown and for all other events it was recovered on an unknown date in Mar2021.  No follow-up attempts possible. No further information expected.