My autistic son keeps hurting me :(

Hi everyone, 

My son is 8 year old with autism, he is non verbal. Lately he keeps pinching and scratching me and trying to put all his body weight on me or kick me. I'm only 5ft 3 and he is already huge and I can't even lift him. I'm really getting fed up with the hurting I cried my eyes out today because I couldn't take much more. No matter how many times I tell him no, remove his hands from me or send him to his room for time out he doesn't listen and finds it funny. I'm covered in bruises all over my arms from him. When I cry he couldn't care less he just carries on hurting me its like a game to him. He doesn't do it to his dad just to me. I feel like he hates me :( I'm so exhausted and now it's summer holidays I don't see no hope of any respite because dad works all day so I have to take care of him along with his 9 year old sister and 1 year old brother.

Think I'm just looking for some advice or if there is anyone else having the same problems. 

Thank you