He is not hitting out at you because he is angry with you, he is hitting out at you because he feels safe and secure to let out his feelings.
This does not make it ok that he hits you, I just wanted you to not take on that he doesn't care about you on top of all the other stuff you have to deal with.
My daughter is being assessed for Autism at the moment and she hits out usually at me or her brother, so I know how challenging and upsetting it can be.
It is usually around big emotions or feeling out of control, all of which can be exacerbated by hunger, tiredness, lots of demands.
My advice, regardless of whether he has additional needs or not would be, regular snacks, environment as calm as possible, reduce any demands on him down to the bare minimum for functioning, make time for some one to one time, reassure him that you love him even when you dislike his behaviour, redirect, when my dd starts lashing out I remind her of things she can do instead, yell, stamp, hit the bed or sofa, have some quiet time.
It is so wearing, try and get some support from school if you can, and try and do some things for you if you possibly can, you can't deal with this stuff when you are under resourced as I am learning, I have developed severe psoriasis as a result of all the stress.
Hugs 


