I have this unexplainable discomfort between my shoulder-blades. I'm also tired and really short winded. Sister had a triple by-pass last year; mom has arterialsclerosis, dad passed away from congestive heart failure, uncle died last year from massive coronary. I don't know if I'm just paranoid or should seek help. If I do anything requiring physical starin (like shoveling) I can't catch my breath, and my heart feels like it's goping a hundred miles an hour. Advise?