I don't know if you followed Lew Rockwell's site and read articles on health from Bill Sardi or not, but that makes it even harder to understand what the hell happened here.  It sounds a lot like what happened with my husband, who passed away almost 1 year ago (on 3-16-21).  Heart attack in a previously perfectly healthy person, who first contracted cancer or diabetes and then the heart attack hit.

At any rate, this is long to read, but interesting if you're of a mind to play detective yourself.  You might see this from a different angle entirely, who knows. 

https://www.lewrockwell.com/2022/03/no_author/bill-sardi-transitioned-out-via-hospital-great-mystery-given-what-he-took/