Yes, sensory diet, I was googling that last night actually!! I just might start a thread when I back get home. It's hard because some of the things I feel would benefit him, he is not willing to participate in. Or he might be willing but only in inappropriate settings (like for ex. he is more comfortable at home but we have a very small house so active play is kind of limited indoors but he's not willing to do the same things out in the yard or at the park because he doesn't like the traffic noise or the people or the sun or the wind or the speck of dust or whatever).
wow. the sensory piece is huge for him.
I spent a lot of time getting my DD comfortable at the park. I figured out what time of day was best, which park was best, etc. We would go for short trips and just do one thing. Like we would go to the park at the same time every day for weeks and swing for 15 minutes. And then leave. I know that sounds crazy to people who haven't BTDT, but it worked. We were gradually able to build up to more time, more activities. It was an upward spiral, as she started getting what she needed, she was more comfortable getting what she needed.
But every kid is different. For some kids, brushing is really helpful. For others, a weighted vest. For some, things they can touch -- a bowl of dry cornmeal to play in, finger paint, etc.
Another book you might find massively helpful is Quirky Kids.
It's about the parenting side to having a child that is different, what therapies are out there, how parents feel, different stages of childhood, etc. It's like getting a big hug from a friend who has BTDT.