Asperger's/PDD

It sounds like you're learning to read him and work with his own way of interacting with the world. It's going to be a long journey.

My son is old enough that he wasn't diagnosed with the Asperger's until he was 18 and halfway through his senior year of high school. All I knew was that he was fundamentally different from other kids. He was obviously very bright, appropriately verbal, and not at all social. I had to work with him and coach him about ordinary things that I knew other moms didn't have to with their kids.

I'm certainly no expert, and your son is quite different from mine, but I'm guessing he can learn a great deal over time, and perhaps will be able to be independent eventually. If that turns out to be not totally realistic, however you can get him to interact in the world, you'll be helping him enormously.