I understand what you are going through. I have an 11 year old that is Autistic, ADHD, and has sensory issues, plus my 5 year old son has ADHD, PDD, and has many ssensory issues as well. When my youngest gets overstimulated, I hold him in my arms, and try to rub the top of his head down the back of his neck. He finds this very soothing. (he also puts things in his mouth, and his hands in his pants when overstimulated) The bean box, or rice box are great ideas also. I know how hard it can be- loud noises in my house, unless they are being made by my son's can turn my home upside down. I found with my older son, that if he has his own music to listen to, with headphones, it relaxes him, and he is old enough to go turn on his music, and tune out everything else, until he feels better. My 5 year old relaxes to music as well. When he was an infant all that would calm him was the Phantom Of The Opera CD!!! Now I just hold him and we sing together. Sensory issues are hard to deal with because sometimes you don't know what will set your child off. I try my best to keep my kids out of these situations, but it will never be perfect. Keep up with the agency that is providing your son's OT. Hopefully soon they can find someone elso a bit less strange. It is also possible that the increase in bad behavior has to do with more demands being placed on your child as he grows older. ( and I don't mean unreasonable demands, but with kids that have these type of problems, it seems that the littlest bit extra can make their behavior worse, until they adapt.) Good luck with your son, and I hope I was able to help a little.