Sorry you are going through this.:(
Random aches and pains can be part of the anxiety experience...and you have been checked out thoroughly and recently from a medical standpoint....so now is a great time to focus on anxiety management skills.
Here are some great exercises to get you started.:)
S.C.
Self Help sites with breathing/relaxation exercises instructions
Panic attack relief exercises:
http://www.healthcentral.com/anxiety/c/73076/34334/breathing-lessons/
http://www.healthyplace.com/
http://www.stress-relief-exercises.com/
http://www.ehow.com/video_4405003_breathing-exercises-panic-attacks.html
http://www.psybersquare.com/anxiety/panic_relax_I