They'll ask questions about your family, health issues, and how you feel about the surgery. Just be honest. There is nothing to it. I was diagnosed with severe depression a few years back, so far it has been a year since I have been off the meds and I feel great. We discussed this. The Psych did warn me that I have a huge chance of relapsing for no apparent reason at all. It was noted in his letter to Dr. Callery. I have promised that as soon as I have an 'episode' I would contact a doctor.
The psyche eval, is just to make sure you are mentally fit and are capable of handling this huge life changing event!
Don't tell them about the bodies in the closet, don't tell them about the voices coming out of the mirrors and don't wear the bunny suit
Do stress that this surgery is a TOOL and not a CURE.
__________________
Diana 
Highest weight:
221 
/Current: 149

/ Goal: 140

Consultation: 05/18/07*
EKG: 05/29/07*
Gallbladder Ultrasound: 06/05/07*
Bloodwork: 06/05/07*
Psych Eval: 06/18/07*
Dietary Seminar: 06/27/07*
Pre-Op Seminar: 07/05/07*
Pre-Op consultation: 08/15/07*
Surgery Date: 09/11/07*
I am a proud yet humble loser!!!!