I'm new here :)

Hi everyone, I've got Son who's 20 months nearly 21 months, we've been told he had traits of autism but because of his age they won't say he has. We have sure start working with us who agrees that he does, and my mum who works closely with autistic children and she agrees aswel, we also have a speech therapist who is working closey with our community paediatrician she also agrees. The thing im struggling with at the moment is the violence, he's only 20 months but he hits, kicks, bites, pinches, punches, scratches, slaps and even strangles. He's a big lad for 20 months aswel so everything hurts. But every suggestion we have been given hasn't worked. So I'm hoping someone here can help me? Every 10-20 minutes I'm getting punched or hit and I really can't cope any more. So if anybody could help us I'd be so so so grateful. Thanks :)