Thanks for the ideas and input everyone! We tried the Feingold Diet, but it didn't seem to make much of a difference. Caffeine does help with his behavior, but it's hard to find something Feingold - friendly that he likes. Even caffeinated Crystal Light has artificial ingredients. I think you're right about the food, though, I need to start a food diary.

I like the obstacle course idea! We definitely won't stay home, but sometimes I just dread going out with him. I've spent lots of time crying in the car after bad public experiences.