Low blood pressure 108/44?

It sounds like your anxiety is more of a problem than your heart condition. Being a former hypochondriac, and having a heart condition myself, I know how you're feeling. If your condition was something serious and life threatening, the doctors would have found something during your visits to the ER. You have to realize that paying attention to every sensation in your body is only going to make you feel worse. Hopefully the doctors can reure you tomorrow that you will be fine.