I feel exactly the way you do...but how many times have I said that I should just do all the "work" required of me after the surgery, without the procedure? And how many times have I completely failed and binged and then I'm back to square one? It really is very hard to explain to someone who hasn't had the mental (and physical) struggle. Personally, I'm hoping the pre-op visit with the psychologist will help me to articulate things (and I am planning to work with her for a while after surgery, too).
I wish you the best of luck, and we all know that we wouldn't be doing this if it was as easy as just "following a diet" and losing! Take care!