I have shortness of breath with exertion, worse when I bend over or crouch down. It is relieved within a minute when I lie on my back. Before sudden onset (4 months ago), I had boundless energy and extremely good stamina, capable of doing physical work for 10-12 hours a day, walking 40 miles a week at 4 mph. etc. Now I am out of breath even walking fast, lifing heavy things, raking, shoveling . . . If I continue, I feel like I could collapse. Leg muscles sometimes go limp and a won't support me. EKG, chest x-ray. echocardiogram, CT scans, lung function test, blood tests, all good. A large (5 by 6 centimeter) hemangioma was found on my liver, but may have always been there. After on and off strenous work for 3-4 hours, I have a dry cough, sore throat, and my chest cavity feels like I've run for miles gulping cold air. Occasionally I have mild chest pain. I've been told that my gums are dry. Thanks for any direction you can give me.