I ve been having shortness of breath, cramps in my legs, what feels like a rapid heartbeat, weakness, and dizziness for well over a year now. I ve gone to a heart specialist and had an EKG, worn a Holter monitor and had a stress test with normal results for all. My primary care dr. says my lungs sound normal. I can t function on a daily basis because whenever I try to do something I get so out of breath that I can t. I don t know what else to do,