YIKES KATE!!! RUN AWAY FROM THIS PSYCH JOB!!! and have a long talk with the surgeon about these issues - only to make him/her aware of them. It can take a long time and many attempts to find the right counselor for you. if you can't talk with the person and be honest, feel safe, and get some help, find someone else.
having said that, the hormone changes from the rapid weight loss, plus the fact that we lose our main coping mechanism can bring up a lot of emotional surprises. I don't want you to be caught off guard in case it happens. Be aware of what's happening with your emotions after the surgery, and be prepared to take some sort of action - and that can be anything from exercise to knitting to talking to a friend or reading a book or seeing a counselor.
you're OK. you've survived a lot, and you will get through this