Shari,
I think you wrote a descriptive letter that gives a great look into what has been going on the last 18 months with various docs. His "new" diagnosis should qualify him for some good services. Begin to research, on your own, what programs are available for autism. With the current rise in awareness, you should find some good support out there. I'm not sure what state you live in, but here are a couple links to get you started.
neurodiversity.com | autism support & services : midwest
Resources for Pervasive Developmental Disorders
Sharon
