Here are some more relaxation coping techniques.
http://www.stress-relief-exercises.com/
...and remember my favorite mantra:
"I am okay, this is just anxiety making me feel this way."
I know it is hard to believe this at times...but you have been cleared by your doctor that you are physically fine, so keep repeating this to yourself, it does start to change our thinking after some time...and keep working on your coping skills...things will get better!
S.C.