Op, if you consider all behaviour is communication, what is your ds trying to communicate?
Are u on any Sen groups?, support? Is he at school? Have EHCP? What support is in place for ds? What does he need?
He is your ds, but all kids need care and support also. You made choices around having kids/sex/ birth control, and it does sound hard work but what is in place to help as you move forwards?
Do you get respite and does it help?
Is he verbal? Does he have support for managing behaviours?
What are u hoping from your post?
You obviously can put your child in care, but that has long term damage for you, him and all your kids.
No easy answer, but you are not alone!