Question is contained in opening sentence, ie why? May be many things I could have, but diabetes or CABG should have been avoided.
Accept that there are a number of factors involved but by eliminating or reducing prime ones, should drastically curtail risk and current regime should prevent it deteriorating again.
So, in the end, there's no right answer other than - stuff happens. Well, suppose medicine is an art as much as a science.
No, there's no other question, never has been - except, maybe, why didn't I eat more cream cakes, but, then, rock climbing's more fun.
Thanks anyway, ciao.