P.s my SIL son is autistic and has adhd as well, and they behave very similar do you think this could be a link at all??
From what I have read/heard, yes. They say that with these types of kids early intervention/therapys are REALLY important. As much as you just want your DS to behave like a "normal" kid, the sooner you can find the triggers/reasons for these behaviours, the better off you will all be. Best of luck. xx