Well RCB, I too have had and still have similar pains that come and go in my chest. Now mine is Anxiety related (at least now it is as I've accepted it) but during my "Trying" times it was a horrible heart issue always swimming around my head. Every single twitch was a lead into something serious. Truth be told, after 3 ER visits and a sleuth of tests (all coming back normal) i was put on Celexa and given some Ativan.
How it was explained to me was the Anxiety I felt caused my chest to tighten to the point where no matter how much i tried to relax the sensation would not go away. It would randomly spike with intense knife like pain, and then subside, but the tightness stayed. This would usually last all day long until the next morning. My heart is good, my health is good, my mental health is a work in progress.
You have to accept the results you have been given and try to ignore the symptoms and live for the day, each and every one. Life is too short to wonder when we will leave, so it's best to accept it will happen when it is our time and to enjoy what we are given. Accept that in some way your pain and anxiety has opened your eyes to other doors (religion, spending more time with family, doing what you love) instead of thinking your pain and anxiety is a curse. Mine is a double edged sword. Without my experiences i would have likely not quit smoking, still had a horrible diet, payed less attention to family and more to work, found my faith again, etc. etc. etc.
It is not easy, but you and everyone else can and will reach these goals if you want them. Baby steps my friend. Gotta learn to crawl before you can walk :)