My suggestion, for what it's worth, is to have your GP refer you to a cardiologist. Presumably he or she will recommend a bunch of tests to get a clearer picture of your heart. I assume that would include a CT scan. Don't worry about the cost. If Medicare doesn't cover something, throw yourself on their mercy. We all deserve good care. You could probably go straight to the big time center, but you might want to do a little research first to find out who the best surgeons are. I'm learning all this from this group here, so stick around. It'll help.