Wow! So glad to have you here Woodi!
ETA- and yes, it is scary! I was 57 and when they announced after the EKG 'acute MRI' I told them "I'm too young" which we all know is not true, but it felt it at the time. Mine turned out to be something rare called Takotsubo Cardiomyopathy. All heart issues are terrifying.
I hope you're starting to feel better now!