Similar situation, but I had (and still have) issues with the heart, and not sure whether they were from undiagnosed covid infection (never had typical Covid symptoms, and all tests for it came negative), or some rare complications from the vaccine.

I started having heart flutters a day or two after my shot and had severe fever (I was 25 at the time), but the former never went a way. I brushed it off as a temporary symptom and typical after shot reaction (well, fever was at least). Heart flutters never went away and I didn't go to the doctor for at least a few months, it became so frequent that I could not sleep, exercise or even climb the stairs anymore without heart feeling like it's about to explode out of my chest. Not the high heart rate, but abrupt, irregular vibrations/twitching and sometimes feeling like you get punched in the chest, just from the inside around the heart area. Anyway, it happens frequently and in any situation, even at rest.

Got diagnosed with third degree AV block. The flutters were due to the significant damage to the heart muscle, which caused the failure of the conduction system - signals from the upper chambers did not always reach the lower chambers.

I am not angry at anyone or anything, just disappointed. It would feel a lot easier if it was some obvious bad decision of mine, like drinking, doing drugs, smoking, or being overweight, but I did not nor were any of these things. I still keep categorizing life as "before" and "after".