The only advice I can give in this situation, is ask your doctor if there is anywhere else he can refer you to. You say he is supportative, so he might be able to do this.
I've been vetry lucky-I spoke to my doctor afyter sending him a letter on 13 june, and got a referral date for 13 July. i now have a further meeting on 10th of august.
Does your doctor know any NHS Learning Disabilities psychiatrist specialists, as that's who I've been referred to in my area?
What are the Mental Health team's criteria for assessment? If you can find that out, and it's on the symptoms of AS perhasps you and your doctor can work together to write an explanation of how you DO fit the criteria, and send it to them. It's worth a second try. the worst they can do is refuse again (although that is bad enough! Idiots!)
Did they tell you HOW you don't fulfuil the criteria? If not, perjhaos ypu or your doctor could write and ask, and you can (hopefyully) prove them wrong. What jerks they are for assuming they know you without even seeing you!
i hope this helps. If there is any other way I can help, please let me know. For example, I wrote a 3-page logically set out document for my Doctor, explaining why I wanted to be tested, and showing how some of my problems fitted the "triad of iompairments. I didn't get on with him, was scared he'd still reject my request but he called me in and told me her was "very impressed" with the research I had done and the way I had set out my arguments. If you think a copy of thios would help, as a template for you to set out your own case, I can Email you a copy.
Julie