OP,
please call SS and tel lthem that you need an emergency assessment.
It may indeed be time that, for everyone - including your son - to be able to have any sort of reasonable life, he should go into residential care.
You describe an older child's strength. Soon that will be an adult's strength. You are clearly not able to cope with this alone and do personal care if you're being attacked. If your son was in residential care, this would be done safely with more than one person.
You have other children. You are right, this must be impacting them hugely. And what if your son injures you or worse? Who will be there for them then?
And, emotionally. You are a wreck. And sleep deprived. And presumably unable to work.
Can you imagine how much better a quality of interaction, of communication, of love, you would be able to provide for YOUR SON as well as your other children if you were able to sleep, work, and heal?
Of course you love your son. Putting him into residential care where his needs can be met SAFELY and you can become someone who can actually mother him and love him and enjoy spending time with him, as opposed to enduring him, is possibly the biggest test of all.
Carrying on like this is not the best way for anyone. Please call SS.