heart fluttering all day; irregular heart beat (4 beats, one skip, 4 beats, one skip); anxiety; Resting Heart Rate was in the upper 90s and when I stood up it was 120 range; I probably HAVE  Covid now from sitting there with no one helping me; I could not get comfortable sitting; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 54 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 29Dec2021 14:00 (Lot number: 331308A) at the age of 54 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Cholesterol" (unspecified if ongoing), notes: Other medical history: cholesterol (controlled w/ meds); "COVID" (unspecified if ongoing), notes: If COVID prior vaccination: Yes. Concomitant medication(s) included: ATORVASTATIN; FLORASTOR [LACTOBACILLUS ACIDOPHILUS]; PROBIOTICS. The following information was reported: CARDIAC FLUTTER (medically significant) with onset 30Dec2021 07:00, outcome "recovering", described as "heart fluttering all day"; HEART RATE IRREGULAR (non-serious) with onset 30Dec2021 07:00, outcome "recovering", described as "irregular heart beat (4 beats, one skip, 4 beats, one skip)"; ANXIETY (non-serious) with onset 30Dec2021 07:00, outcome "recovering", described as "anxiety"; HEART RATE INCREASED (non-serious) with onset 30Dec2021 07:00, outcome "recovering", described as "Resting Heart Rate was in the upper 90s and when I stood up it was 120 range"; SUSPECTED COVID-19 (non-serious) with onset 30Dec2021 07:00, outcome "recovering", described as "I probably HAVE Covid now from sitting there with no one helping me"; DISCOMFORT (non-serious) with onset 30Dec2021 07:00, outcome "recovering", described as "I could not get comfortable sitting". The events "heart fluttering all day", "irregular heart beat (4 beats, one skip, 4 beats, one skip)", "anxiety", "resting heart rate was in the upper 90s and when i stood up it was 120 range", "i probably have covid now from sitting there with no one helping me" and "i could not get comfortable sitting" were evaluated at the emergency room visit. The patient underwent the following laboratory tests and procedures: electrocardiogram: (30Dec2021) unknown result; heart rate: (30Dec2021) upper 90s, notes: Resting Heart Rate; (30Dec2021) 120 range, notes: when I stood up it was; (30Dec2021) irregular, notes: irregular heart beat (4 beats, one skip, 4 beats, one skip) all day; sars-cov-2 test: (25Jun2021) negative, notes: Nasal swab. Therapeutic measures were not taken as a result of cardiac flutter, heart rate irregular, anxiety, heart rate increased, suspected covid-19, discomfort.  Clinical course: Patient stated that the next day after the vaccination, he woke up with events. He called his heart doctor who told him to go to ER, he went to urgent care, and they refer to him to go to ER. The skip beats did not subside in 2 hours and then he went to ER and sat there for 6 hours and had EKG, and finally left. He stated that he had probably Covid now from sitting there but no one helping him. His heart fluttering subsided, and he stated that he will try to get chest X ray tomorrow.  No follow-up attempts are possible. No further information is expected.