Amicrazyornot you are right to be worried if he is already trying to control things before the counselling session has even began!
"I just feel as if he is trying to control it all and ensure I am going to be ganged up on, so his opinion is the only one heard and I am terrified to be told my feelings are irrational and be dismissed again."
You know the session is for both of you, you and your husband. The counselor is someone you are hiring to do a job for you. Presumably you are paying him or her, or someone else is, to do this job on behalf of both of you. If you feel the counselor is being unfair you can say so, give your reasons for this, and ultimately not engage if you do not wish to.
I've had a lot of counselling (for OCD) and my dh and I have had some counselling due to fertility issues, normally the counselor is very good and it's worked well. If this isn't working well for any reason you can always voice your concerns.
Good luck.