As far as the therapist goes, a good child therapist will be used to working with kids who aren't so sure they want to be there.
As for the discipline, the most effective method of discipline I've heard of for kids that age (and I used to teach 6th grade, so I know that age well) is as follows (it may seem harsh, but if you don't catch his attention now it will only get harder):
Step 1: Warning, explain to him that all of the things below are going to happen if he doesn't get his act together (be specific about exactly what he is doing that needs to change).
Step 2: (if the warning doesn't work, sometimes that is all that is necessary)
Remove EVERYTHING from his room and his belonging with the exception of the following:
- his bed
- a place to study if he has one (such as a desk or table)
- a light
- an alarm clock if he uses one, unless it has a radio
- a set of sheets
- one or two outfits, of your choosing
- school books and a book or so to entertain himself with
He loses all priviledges, he has no TV priviledges, he may not have anything in his room that you do not specifically approve of. He can not go out with friends or have friends in. He must come out and sit with the family for meals, and any other time you ask for his presence, otherwise, he is to remain in his room. The only person he can have in your room is yourself (your boyfriend would be okay too, if you are comfortable with that). He remains in this stage for 1 week, during which time he must prove that he is ready to regain a priviledge. If all goes well at the end of that week, he can have one item back (you can choose or you can agree together as to what that will be).
He gets that item back for the weekend. If you still feel that he is putting in his full effort at the end of the weekend, he is allowed to keep the item . If he slacks back off, it gets removed.
Step 3: He continues like this, regaining one priviledge a week. (you may decide after a set amount of time, perhaps a month, that he can have a group of priviledges back such as free roam of the house, friend priviledges, etc. If at anytime he reverts back to his old behavior he loses the most recent priviledges that were added and gets no new priviledges for two weeks. If it still continues, everything comes back out, and he has to re-earn his things back.
By the time he is back up to having all of his priviledges, behaving will be a habit. I've seen this work for kids whose parents and teachers were beginning to feel like it was hopeless.