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I'm not a doctor, so maybe there's some deep difference between something that has the same symptoms as a heart attack and a heart attack. Regardless of what exactly it was, it freaked him out, it freaked me out too and I'm glad there doesn't seem to have been a recurrence (or if there was he chose not to tell me, knowing that I'd tell him again to see a specialist).

"Both the Vaccine and Covid are known have a low chance of causing heart issues."

It is 'known' by people who are deeply conflicted by their own pushing of the shots and could thus never admit it, if their policies had led to immune or heart damage. Nothing much can be said about vaccine safety given that the public health and research system are clearly terrified of doing or saying anything that might reduce compliance with their policies.