Age 75, was very strong and thought to be in good health. 3 weeks age had mi. Cardiologist placed 2 stents in rca. One 95% and thecother 85% blocked, Home, generally feel good, but shortness of breath intermittently, especially when laying back in my easy chair. Dr has already done away with one bp med. bp can be as low as 84, generaliyb112 over 80. Any thoughts on my shortness of breath issue?