Hey thanks alot for the comment. I'm amazed at how helpful this website really is. The supplement I was taking is called N.O. Xplode my doctor doesn't know much about it, only that the Nitric Oxide can cause a chemical imbalance in the brain, and it has a lot of caffeine. But I have been off of it for so long withdrawal should be over. And I know what you mean about taking it slowly and I know you are right, its just so dang hard because my workouts were so intense and strenuous and now I can hardly stand up off the couch without my heart racing and a sense of panic. Thanks for the comment, and advice. It really does mean alot to me.
I think your heart is alright, just let it work and quit thinking about it. Yes, I know it isn't so easy, but nothing in life is easy, just stop thinking about it: believe in yourself and your heart, be optimistic and think positive: start working out lightly, if a bike ride is too much then walk at 4 mph for a mile, then a 1.5 mile... for a few days, you know the routine, work your way up slowly and believe it is RIGHT.
I think your mind is a big, maybe the only, problem you have.
I didn't follow exactly what supplement you were taking and if it was "legal" I doubt it did any damage, and I assume you discussed the supplement with your doctor. If not that would be a good addition to what I say above.
I believe you can do it, and so do you, just get your mind "around it".