Honey.... Has he said he's willing to go to more counseling with you?
I understand that you want him to get help for his issues and are worried about him as a parent. However nothing good is likely to come of counseling right now. He's going to be convinced after this fiasco that you're just trying to hold on to him.
I'd say let it go, get a good divorce attorney and look after your interests.
Also, why did the therapist say obviously your meds weren't working? Were you crying or yelling in the visit? I'm not blaming you, you had good reason to be upset, but whatever it was, you have to figure it out before you end up in court before a judge. I've seen divorce court go very badly for distraught emotional women.