Maybe you need a different therapist, if he's trying to push it too far. When I was in therapy for mine, we pushed it to its maximum and gently put a little pressure and held it. I did things like "wall walks," walking my fingers up a wall as far as I could, which put gentle pressure on the frozen shoulder. It took time, but we saw progress weekly, a little at a time.
If you have the surgery, you'll need immediate PT, that is, the same day, and then for a couple of hours a day after that for weeks, then continue to work at home and sometimes with the therapist. What convinced me to not have the manipulation was reading and discovering the recovery was going to be about a year with or without the surgery. I'd rather not have surgery if it isn't going to make it any faster anyway. That and my friend who had the surgery and is still having major problems, but my other friend (and now me, too) who didn't have the surgery is fine.
Just my opinion...
Emily :wave: