So glad that you are here, back, and doing better!
Had I been about 30 years older, I would have thought I was having a heart attack just a couple days after you! After two trips to the ER, I found out it was only costochondritis. (Not really an "only" when you are the one with it, but an "only" next to a heart attack.
But, regardless of what the problem is, when your heart starts doing funny things, it super scary!
I'll be thinking of you, and take it easy!