I can echo that. Four people in my immediate social circles, out of maybe thirty, had some kind of heart problem within a couple months of getting vaxxed; three with arrhythmia and one with sudden drops in blood pressure. My mother also started having occasional, debilitating dizzy spells after getting boosted, but nobody is sure what the precise cause is.

It's definitely not all myocarditis though. If it were, at that rate, you wouldn't be able to clean the bodies off the stairs fast enough. My best guess is nerve damage, which is something that used to come up early on but hasn't gotten any real attention recently. It's kind of a cop-out answer, since it's too broad an explanation, but it's not like we're gonna get any real answers for decades, if ever.