If you are having serious reservations about the surgery, then you shouldn't have it. This journey is difficult enough for folks who were motivated before going under the knife. I'm almost a year out, and I'm here to say that it is STILL difficult! This surgery will not solve all of your problems regarding overeating. So don't do it unless you feel you are truly ready to do it.
I remember when they wheeled me into the OR, helped me onto the operating table and were strapping me into place, I looked up at the nurse anesthetist and thought " I could say stop right now, and not go through with this." It took all I had to keep my mouth shut until they put me under! And I am glad that I kept my mouth shut, because I know this was the right decision for me, and I never could have been as successful without it. It is truly worth it and is the right decision for lots of people - only you can determine if it is the right decision for you.