I am seeing only one cunt in this relationship and it certainly ain't you OP. DH and I are the proud parents of a very special DS with severe learning difficulties, doubly incontinent (nappies at 12) totally non-verbal, unable to feed himself etc, etc, etc, so please believe me when I say that we could both teach your Husband a thing or too about frustration.
In 25 years of being with my DH he has never so much laid a finger on me nor I him We remove ourselves from the situation, get out of the room, take a deep breath and calm down.
What your Husband is doing is WRONG. End of.
The fact that your DC has autism is no excuse, there isn't one for another person to physically and emotionally abuse others. NO excuse.
I am a huge believer in the fact that people only treat us in the way we allow them to. Next time he does that (and he so will) just stop and think. Why the hell am I allowing this to happen at all and what will the effect of my actions be on my DC,s?
There are so many women whose lives were like yours, thinking they didn't have the strength to walk away, yet they did it and are now living the life we all deserve. I have yet to hear a single victim of DV say how much they regret not being abused day in day out.
Trust me OP, you have that strength too and as a Mother you need to start using it pronto.
Good luck