I've had blood work, EKGs, a CAT scan, thyroid tests- all the tests pretty much and nothing's wrong. But it never fails, whenever I try to do anything, like fold clothes or take a shower, my heart starts pounding like crazy, not very fast, but HARD. I get dizzy, lightheaded and nauseous, I feel like I'm going to faint. Basically I feel like I ran a mile when I'm barely exerting any energy. Sometimes it's a lot worse than other times. Right now is one of the bad ones. I was folding clothes and now I feel like I'm fighting to stay awake. A lot of the times when it happens I'm not even having anxiety! Once it starts happening I start to panic though, of course. And I've tried "fighting through it", but it only results in me getting MORE tired. I feel like I'm living with a terminal illness. Does anyone else have this? How do you cope?