I do a round trip to the gender clinic every three months to visit one of the volunteers there whilst I wait for my slot to come up. I get to share stories with another trans person who has been through the system for an hour or so. Even though they are not therapists It keeps me connected to the clinic and I feel a little less isolated.
I'm not sure if they offer the same at your assigned clinic, may be worth a shot if they do.
I also started seeing a regular therapist at my local GP's which has helped a lot with my mood. Again very informal but she has helped a lot with some of the social fears and negative thoughts I have. Trust me you're not alone with that one Sara.
Just some suggestions that have helped me, I know we all have different lives and practical considerations, but just thought I'd share what i've been up doing to help me prepare for when my appointment eventually comes through.
Hope things improve for you girl, I really enjoy your company on these forums and its always nice to have a fellow Brit amongst all these crazy people. I mean someones got to keep that Laurie and Moni in check right?

I wish you all the best, you're not alone, we're all here for you.
Peace and love and all that good stuff,
Sadie.