Hi NYCgal. I know this may not sound like much, but I have a friend whos son had severe autism. I say had because she put him on a very strict diet designed for children with autism. That and working with him on daily activities designed for these children has worked miracles. There are several places on Youtube that give instructions about these children and activities for them. You will notice a change, it may be slow but noticeable. As far as your mom, I assume you live with her? Wow difficult to ignore someone like that so sorry she is so insensitive to what you are going through. Can you stay in your room more! Is there some place you can spend more time with your son?
Do not lose your faith in God. I am always grateful to have a higher power. Something that is stronger then I am, Someone to listen!
Good luck to you