I am pre-op, too. Day 10 of the liquid protein 14-day diet. As an older woman (60's) and married, I just want to tell you that you are the only one in your life who can make you happy. Concentrate on taking care of yourself. Get to know yourself. Find a therapist/counselor that you can relate with, and talk your head off. For depression, medication is sometimes needed.
I don't know that surgery itself will solve any problems. But the weight loss will allow you to more easily indulge in any activities that you enjoyed when you were thinner. What did you enjoy doing then? What made you happy as a child?
Try to take care of yourself in all ways: physically, socially, spiritually, intellectually. Indulge yourself in a massage, or taking a class, learning something new. These take you out of yourself and open you to the opportunities out there.