To begin with, I would like to congratulate both of you for the decision that you've just made.
For a couple like you, make sure that you don't keep too much history of the behavior. Instead, try to track your reaction when he behaves that way. This way, you can realize what you can do for him during the counseling.
The expectations can be different, depending on the program that you are having, but normally, expect some parts to be educational, some parts experiential. The experiential part is about practicing communication and relaxation in regards to the situation.
Good luck!