Hi Oz.,
Wishing you well on your upcoming procedure!! I am sure that as the other say, you are in good hands...and all will go well.
Of course knowing this does not always eliminated all of the anxiety....and everyone has some level of it when a surgery is in the future.
However, if you feel that it is more than you can handle...let your medical team know that you are struggling, and I am sure that they can help you in some form or another. (either medically, or finding ways for you to feel more in control of the situation while you are in the hospital.)
You should also use your coping skills at this time as you prepare for this time. Here are some great links, if you need ideas.:)
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-
http://www.psybersquare.com/anxiety/panic_relax_I
When is your procedure? Keep posting and let us know how we can best support you during this time!
Scaredy Cat