I haven't had a chance to read all the responses, but I can tell you with absolute certainty...you are not the only one.
My 11-year old has been through the same kind of thing. It's a lot easier to be involved since he is younger.
Our school system has a "zero-tolerance" policy for bullying. It sounds good, but it takes a little work to make it work. Talk to your son's teachers, talk to his school administrators, talk, talk, talk.
Consult with any special education advocates, supporters, that may be available. Talk to attorneys that specialize in education law.
Please, get some counseling for your son. We had to face some suicidal thoughts during the course of our difficulties.
The situation is not hopeless.
My ex is now pretty sure he has AS, too. Explains a lot. I don't know what you can do for your husband, unless he is willing to explore areas that he needs to work on. I know how difficult my marriage was, and how our interactions are still. There are some books written by people, NT and AS, about their relationships. I think some of them have websites. I am just starting to think about going there.
I think it will help your son to know that you are trying to help, and that you love him. He is probably old enough to have a lot of input into decisions and solutions.
Bullying should never be accepted. For anyone.
You are all in our prayers.