Sad to say, but when you are “young” and have issues - you’re in deep doodoo. It’s expected and pretty normal when “old”, but having cancer or heart problems this early usually means something is really wrong with your whole make-up, and can be harder to deal with. It’s noted by doctors over and over, in so many words (I have my list of issues, too, and have run across words to these effects regarding mine and related medical problems).
As a slight aside, I’ll never forget the local sportscaster here who dropped dead at a school basketball game. Yes, he was playing for their benefit, but he was 32. Some heart thing caught up with him. No one knew, and it was a real shock to the most popular news team in the region.
You talking about Glen Campbell, Glen Campbell, Glen Campbell?
I was sick, literally, when he died. And, recall, he had shortly before run the Marine Corps marathon.