I would suggest you find a cardiologist who has a practice that specializes in treating elite athletes. Then have a stress test performed which includes an echocardiogram before and after the stress test. The stress test will show how your heart is performing as the heart rate increases during the workout, and how long it takes to recover after the workout, and the echo will allow the doctor to see how the valves function. Have you had your cardiologist perform a stress test?