Watch out for the "what you think you have" part of it. Remember, this is an outside evaluation. You don't have to tell a story about your life, or try to convince him of anything. And you won't be able to tell if he's good or not, so don't worry about judging his abilities during the evaluation.

What would help is a list of dates, approximate times when you had depressive episodes, medications you have taken, hospitalizations, things like that. You'll be asked about your work history, your romantic history, how many friends you have had and when, and of course a lot about your family and growing up. You can explain how you got your diagnosis before, what lead up to you getting your diagnosis, especially if you feel it was not a thorough evaluation.

I had another psych eval done last month (my 4th maybe? I've lost track.) and it was nerve wracking, and it felt like a personal invasion, but thinking about it ahead of time was a lot worse than actually going through it. The doctor was very calm throughout the evaluation. It wasn't until it was over that he expressed his concern over the level of my mental state.