Well, both docs think the same thing...my heart isn't getting enough oxygen/blood flow under stress. They just differ on the reasons. One thinks blockage, one thinks valve problem. Had blood work and and EKG today. Started taking daily aspirin. And on Monday I call to schedule the treadmill stress test to see which doctor is correct. Oh...and I now have nitro in my purse. The doctor today said that I do have a few things in my favor.... I'm not diabetic, I don't smoke, I do get some exercise, and I didn't wait until things were much worse. So, that's the good news.