Smoke and prayers from my wife and I.
ASD is something I know a little about... My wife is a special needs coordinator in an independent school that specializes in pupils with a range of issues, with a very large number of ASD pupils of varying degrees. She's very, very good at what she does with them, to the extent that other schools send their SENCo's to her for 'training'. I taught in the same school with her for nine years as head of science.
I would most likely make the 'list' myself, if I ever let them test me. I self-tested once and certainly did! My wife one day tentatively suggested to me that I might have ASD, and was quite surprised when I said that I agreed. She thought I would tell her not to be daft. Things like ASD didn't exist when I was at school though; people like me were just being 'difficult' and needed it beating out of them. Needless to say that didn't work, although that didn't stop them trying.
If your son does have ASD, then at least now it's a fairly well recognized issue with effective strategies and much better understanding of the condition. The US is of course well in front of the UK on ASD research so you're in the best place as well.
Please feel free to PM me if you think I could would help in any way.
Best wishes to you all,
Rick.