Pain in the heart; Flutters, felt like butterflies in chest; Heart would pound; Pressure, feels like someone has a fist around her heart and the heart is trying to pump while being clenched; Heart skips a beat or a few beats; Weak and fatigued; Weak and fatigued; Couldn't wake up, couldn't keep eyes open; dizzy to the point of a headache; dizzy to the point of a headache; Heart was pumping hard and slower than like she would think would be norma; This is a spontaneous report from a contactable consumer (patient). A 30-year-old female patient received 2nd dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE) at single dose via an unknown route in upper left arm on 29Apr2021 2PM at 30-year-old for Covid-19 immunization. Medical history and concomitant drug were not provided.  She steered clear of pain meds during her vaccinations. Dad's side of the family has history with heart trouble. Her dad had an adrenal gland tumor removed that was causing heart issues. Her paternal grandpa had to have a stent put in through the vein in his leg to his heart. She did not know exact details, but all on the paternal side of the family. Historical vaccine included 1st dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE) via an unknown route in upper left arm on 07Apr2021 for Covid-19 immunization. No additional vaccines administered on same date of the Pfizer suspect. No other vaccinations within four weeks prior to the first administration date of the suspect vaccine. No AE(s) following prior vaccinations. She didn't notice anything between the two doses. Patient reported events began after the second dose on an unknown date in 2021. She didn't track the dates. She wanted to say the events had been going on for 2-3 months (as of 24Aug2021). Patient could not tell exactly how long after the second dose the heart issues started happening. When the pain and severity she was brought her to the ER.  Heart issues clarified as started off with flutters, butterflies in chest and that was it. It started getting to where felt like somebody had a fist around her heart and was squeezing it. Heart would pound. Patient could not say heart was racing, it's not fast. She felt like somebody has a fist around the heart and her heart was trying to pump while being clenched. Heart was pumping hard and slower than like she would think would be normal. Other times it flutters and skips a beat or a few beats and feel like it's tickling and stuff. After a few days of pressure, pressure became a pain got to the point where in bed it would hit out of nowhere. She would be incredibly weak and fatigued, couldn't keep eyes open. Couldn't wake up. Compared this to the first trimester of pregnancy where the woman can't keep her eyes open, that's how tired she felt. She was dizzy to the point of a headache. It's still happening as of 24Aug2021.First ER visit was a month ago (as of 24Aug2021) and finally got really really bad and was scaring her. Had gone to ER twice within that same week and finally kept her sitting and waiting for six hours so she didn't go back. During first time in ER, she ran quite a few blood tests and couldn't figure out. She did an X-ray where both heart and lungs didn't seem to have anything wrong with them. During second time in ER, she went back within the same week, they did not repeat any blood work or anything. She wasn't until last couple of days that this even was a side effect she should be reporting.  She noticed it after the vaccine, but didn't start paying attention to it until it started hurting. She clarified it was more of a pressure. This was all ongoing and about the same. It flares up occasionally and almost always had the fluttering more times a day than she could count. Pressure comes out of nowhere and the pain, doesn't matter if she was sitting at work, laying n bed, or doing laundry. The AE(s) require a visit to Emergency Room, discharged both times. She was not admitted to hospital.  She was referred to cardiologist, was put on 14 days of constant heart monitor and was able to take it off yesterday (as 0f 24Aug2021). Outcome of the events was not resolved.