I call it too much stimuli. Too much noise and chaos gets to me too, to where I need to remove myself from the situation. It definitely is sensory overload. I don't have it nearly as bad as you can get it, Jilly, but I know exactly what you mean. I go into an anxiety state almost feeling like a panic attack is coming on. When I start to get a little wiggy I know I have to do something about it.
I prefer peace and quiet, with times of joyful noise like my favorite music on occasion. This is one of the reasons I chose not to have kids!