What to expect is : 5-10 minutes autobiography session with him. 5 Minutes of symptom explanations. 5 Mins of med discussion. 5 Mins of "we will get you better". Then a script or two and on your way.

What I wish I did and what I do now every visit: Talk about how your feeling, and if he gives you a diagnosis you dont agree with, let him know. Example my psych said that for someone with major depression I seemed to be able to laugh at myself too much, so he wanted to start bipolar II treatment. I told him No I dont have any manic or hypomanic symptoms. 2 Months later he tells me I was right. Also talk about how your psych approaches these illnesses. Mine for instance is a big believer in SSRI/SNRI + CBT, but doesn't think any of the diet/holistic approaches are worth a ****. That's just his way of doing things. Most important thing I would say is, every visit with your psych will probably feel a bit incomplete. You will always go back and rethink what you did or didnt say and the meds you were given. Just remember that every visit is a step toward feeling better. Trial and Error is really the only answer to this stuff :/. Remember be honest, dont be afraid to ask questions/disagree, and remember HE WORKS FOR YOU. If you aren't happy with what hes throwing at you it is your right and to be honest your duty to let him/her know.