You can also perhaps take a pain pill.
I have had several surgeries for skin cancer, but I found that I was always extremely stressed and worried before each new surgery.
I mentioned it to my doctor and since he had given me a prescription of Tylenol with codeine for pain (I'm allergic to Vicodin), he advised me to take one of those 30 minutes before my surgery, to "mellow me out."
You know, it worked.