That's a long wait for you to see your oral surgeon. If you do see your pt before you see your surgeon... if I were you, I would tell them right up, that you havn't seen your specialist yet and tell them the pains or problems you have with your joints. Because, if they don't know very much about what you are going through, they could cause more damage. That's just my opinion, based on my experience with pt. I was refer to a pt after I have been with my specialist, and after I finished my first three months of splint therapy. The pt couldn't work on me until I finished my splint.
But my best advice to you, is go see your surgeon in June first, and then go to a pt. I think that's a safer way to do it.