I think it is good that the clinician probably knows your therapist; that could work in your favor unofficially (if he "likes" your therapist :-)

I'd look into a disability lawyer if you get a "no" now; lots of them like to wait until after the "bulk" of work has been done before they get involved. They would be able to look through it all and see what they deem your chances based on their wider experience/other cases they've had similar to yours and it won't cost you anything unless/until you get a "yes".