Hoosier Mom's advice is good, she is talking about behavior mod. Ask your son's teacher about what approach they use in the classroom. (I once worked in class of Autustic children and there are so many degrees and behaviors.) It must be very hard for you. Is there an autism society near you? The ones in NJ (Where I once lived and worked in) offer respite care.
I can't imagine how hard it must be.
PPMS, DXed 2002 Queen of Maryland
Wise Elder no matter what my count is.