Anon - prayers are with you. My father had a heart attack 2 years ago, but thought it was indegestion and walked around for 1 1/2 years with significant damage. A physical in May of this year discovered it, and he went immediately into a triple-bypass. I'm happy to say that he is doing well.
It is amazing how/what the technology and surgeons can do these days. I'm sure he is in fine hands and will come out better than ever.
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