I hope you don't give up chelation. My son battles the yeast, too and we have to go slow. It is hard to get all the stuff in him.
Dr. Holmes first studies showed that children under six did the best.
I just saw recently her new studies show that under 8 do the best.
Dr. Andy Cutler at the autism-mercury yahoo groups believes that once ALL the mercury is gone, the brain cells CAN and WILL heal. I fear that some people will see small gains and give up. I think this is a big mistake. The gains you see along the way are likely to be cells that have been freed up so that they can heal. But, there are more to conquer.
I know your child will be restored someday if you keep plugging away at it. The hardest part,I think, about him being 10 is that he has had ten years of doing things the way he does. I think that the meltdowns when he starts caring about social things will be very sad. My son is 7 and I've noticed that with him. The awareness and changes scare him and he becomes so aware of that gap. It is sad, but you can work him through that, as you have everything else in his life. And this one...there will be a bright rainbow at the end, I'm sure.