I have to agree that you deserve a diagnosis, in order to have an idea of what you're dealing with. I don't think it's fair for your therapist to just leave you hanging in "outer space," floundering around, not knowing at all what's going on!
I would DEMAND a diagnosis so you can know what's going on!! We should be able to do our own research to a certain degree! I did, and I believe it helped me better understand my problem. So YOU deserve a diagnosis too!
This therapist is working for YOU. He is YOUR EMPLOYEE -- you can FIRE him if you so choose. So tell him what you want and when you want it!

And if he doesn't come thru, then fire him.
I wish you the very best. Please take care, and God bless. Hugs, Lee