I think it is a form of dissociation, a protection mechanism when you become overloaded. I just go into a trance and I can't move, like everything around me is still going on but I am in slow motion. I just have to switch gears, when I feel it coming on, get up and do something else, focus on a task and it doesn't hit as hard. It it does hit hard, i usually end up in bed sleeping it off. What a pain in the ass huh?