Today my son, 4.5 years, saw an Occupational Therapistic who confirmed he has [link|http://www.sinetwork.org/whatisdsi.htm|Sensory Integration Disorder]. In the OT's words he is a classic text book case. So now we have a reason we can wrap our minds around for his behaviour patterns and confidence that his condition (I really dislike that term) can be corrected or at the very least improved to point where it is not a problem for him or those around him.
A year ago my wife was seriously considering changing the pre-school he attended but his friends were there and the pre-school she was considering cost 3 times as much. Our doctor assured us that he was just an active boy. So the school change didn't happen then. This year we changed schools anyway. We saw an immediate improvement in him just from that. The teachers recommended he be evaluated and so now we know. I regret that we didn't change schools last year, we came so close to doing it and he'd be so much better off now. But that's water under the bridge.
The OT is going to put together a therapy program for him and in 3 months she says we will see a dramatic improvement in him. We are looking forward to that.