He is on disability because he gets migraines so bad they put him down.; Felt like he was going to pass out; and he felt kind of weird, but they let him go. Next day, heart was feeling weird; Heart was fluttering in his chest/ was told his heart rhythm was off and his heart was doing butterflies; a slow gradual progression of my heart rhythm changing; irregular heart beat; 5 days later in ER for inflamed heart.; This is a spontaneous report from a contactable consumer (patient) from Pfizer-sponsored program with Regulatory Authority Support. A 48-year-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), dose 1 via an unspecified route of administration, administered in Arm Left on 22Mar2021 13:00 (Batch/Lot Number: EN6207; Expiration Date: 31Jul2021) as DOSE 1, SINGLE for covid-19 immunisation. Medical history included pre hypertensive and degenerative disc disease both from an unknown date and unknown if ongoing. The patient's concomitant medications were not reported (also reported as It is a very low dose pulse reducer, not a beta blocker because his blood pressure is really nice (patient did not provide a product name). The patient previously took morphine and prednisone and experienced drug hypersensitivity (also reported as known allergies).  The patient reported that "a slow gradual progression of my heart rhythm changing which lead me to the emergency day 6 days after shot, hospital couldn't find anything wrong with my heart but could only blame my recent shot, they would not give me second dosage at vaccine center in fear it may cause death" The event was reported to occur on 27Mar2021 06:00 PM that resulted in Emergency room/department or urgent care and no treatment was noted. It was also reported that 5 days later in ER for inflamed heart (also reported as was diagnosed with inflammation of the heart 5 days after getting the first dose of his Pfizer BioNTech Covid-19 Vaccine disappeared and asked how he is able to retrieve it). The patient asked is it recommended to get second dose or how should he continued? The patient told his experience after the first dose and the center contacted the hospital he had visited because of the issue he had with the first dosage. He met with the head of the vaccine center and the CDC. The representative told him they could not advise him to get the second dosage. When he goes to the doctor, he was told he will have to have the vaccine card if he wants to travel next year. He is going to have to have the second dose. The patient asked his primary care which one to take. Primary care advised he take Pfizer because it is the easiest one for his age group. The patient states he is caught in a conundrum because he needs the vaccine to do certain things. He is on disability because he gets migraines so bad they put him down. The patient also stated he only takes one thing heart related. It is a very low dose pulse reducer, not a beta blocker because his blood pressure is really nice (patient did not provide a product name). What happened after the COVID-19 Vaccine dosage, he was given it, and he felt kind of weird, but they let him go. Next day, heart was feeling weird. Felt like he was going to pass out. Heart was fluttering in his chest. Hospital did an EKG, was told his heart rhythm was off and his heart was doing butterflies. Hospital did a bunch of blood work and looked for clots. Told his blood work and urine looked as good as a 20-year-old. Hospital said the only thing they could tell him is the inflammation of the heart and irregular heart beat after the COVID-19 Vaccine shot. Stated it gradually passed after 2-2.5 weeks. Every day it felt less and less. He has no problems with his heart. It was the only think peaking after the shot. he needs to know what to do. The patient stated that he wasn't able to get his second dose of the Pfizer BioNTech Covid-19 Vaccine since his first dose last 22Mar2021 caused him heart inflammation. The patient wanted to know if he can still proceed with his second dose and if there is a change in the ingredient of the Pfizer BioNTech Covid-19 Vaccine between the first and the second dose. The patient also wanted to know if he would be contraindicated in getting the second dose of the Pfizer BioNTech Covid-19 Vaccine if he experienced inflammation of the heart 5 days after the first dose of the vaccine. The patient missed the 21 days recommended dosing schedule for the second dose. The patient underwent laboratory test which includes: covid test type post vaccination (Nasal Swab): Negative on 18Sep2021. The outcome of the event a slow gradual progression of my heart rhythm changing and irregular heart beat was recovered for all other events was unknown.