I'm so saddened to hear of your troubles. I will keep both you and your wife in my prayers.
Given the diagnosis of your wife is it possible that your heart pains are stress related? I had that pretty regularly when I was still working.
One piece of advice I can give is keep a bottle of aspirin handy and take a dose as soon as you have chest pains. My Doc told me it was the best way to survive an attack while help is on the way and also gave me a small vial of nitroglycerin.
Of course you should check with your Doc first to be sure.