I'm Frenchie and we live right next to each other; I'm from Montreal. Incidentally, myproblems stem from the back as well so I can relate. TMJpain too is from Ontario (Ottawa).
You said you went to many pain clinics. Been there done that. Except I think it's worse here in Quebec, as in getting in a pain clinic. The only one available here is at the General Hospital downtown and is run by a fascist arrogant doctor whose name I will keep a secret. Since I said I wanted a second opinion (I felt he could have done more for me), he kicked me out. Bad memories. I guess that what you get when you don't pay them directly....(Screamingeagle stop smirking lol)
I started to go to private places now and in the process, going through all my savings but I have no choices really.
I have kids about the same age as yours. Mine are 11 and 15. It's very hard on them. Are you a dad or a mom?