I get it too, touch and sound in particular. I regularly need time out where it is quiet and I can be alone so that I don't go nutso. A bath is great for me to calm down, and I often have no TV or music or anything on when DH and the kids aren't home, and in the car. I also find getting grounded in nature and hearing the sounds outside calm me too. I am often turning down the TV or radio/music and asking the kids to speak/play more quietly because I get overloaded with it.

I think my DS2 gets overwhelmed by his senses too, particularly noises. He often covers his ears when there is loud noises and if he's really feeling bad, he flaps his arms and goes a bit crazy, running around and yelling.