I was very afraid when I went as it was my first surgery ever, and in a foreign country, the dr's staff were very comforting for me, lol the anesthesiologist was telling me to calm down as my heart was arace, I had never been under either so I was so stressed. but I still got on that table and said "I'm ready", I kinda feel where you are coming from on this. the only difference was I wasn't really worried about pain as I have been battling with it for quite some time, the thing that had me concerned at the time was the anesthesiologist couldn't do a epidural block on me because of my health he said he felt he could control my pain after I awoke, I have to admit it was more than I had thought, and I ended up vomiting, but I pull through. One thing I always kept in my mind to help me along was a the need for srs on a scale with the emotional pain and mental battle that I was fighting daily, and the need always outweighed to continue the battle I kept fighting. so maybe if you keep it in your mind as such as well perhaps it will ease your fears as it did mine. your very lucky to be able to have surgery so your I am quite envious of that fact.I myself chose to continue my self argument till 33, where it became to much.
your Dr. isn't the same as my Dt. but I am sure you will be taken well care of. I will ofeer if you ever need to talk to someone or ask a question you can always pm me and I will answer you

Congratulations and may you heal quickly!