mrshess Stop that. You are a vulnerable mother, emotionally tied up in getting the right support for your son.
'They' are paid, trained and experienced in fobbing-off techniques. DO NOT EVER feel guilty about not being able to match that.
Firstly, get yourself a copy of Hanen 'More Than Words' and try to change the way you parent to seize all the opportunities that are presented for communication.
Research Applied Behavioural Analysis, and possibly get Catherine Maurice's book 'Let me hear your voice'.
The biggest mistake I ever made was to spend too much time battling for shoddy provision which my ds is 'entitled' to, but the quality of which is absolutely not worth the battle. The sooner you face up to the idea that it is YOU that is going to make a difference to your ds the better really.
It is bloody unfair, both the effort required and the emotional burden this places on you, but whilst it might all seem very daunting at the beginnin, actually, once you know what you are doing your parenting style kind of delivers the therapy and you stop thinking so hard about it.
If you can afford a private dx then get one now, as that will give you credibility when talking to the teachers about his needs. Don't let go of the NHS one though. Insist that your private one is a 'second opinion' that just came first, and as I said, just get asd (there are other benefits of this that will come later in his education).
I'm always a bit blunt and bloody miserable so I apologise for that. One step at a time and you'll get there.
hth
oh, and start as many threads as you like, with as many questions as you like. Some of us that have done a bit of battling like to help others avoide the mistakes and wasted time that they have experienced.