Pretty much the same thing as me: I once described it to a friend that it's like being in a packed movie theatre with everyone talking, and instead of one screen there were three, each one showing a different movie.
Funny how it all shuts up when in a social situation. I guess it's either unfocused thoughts or none at all.
It's worse when they steer you off course suddenly. Like today I sort of snubbed a friend: she was on her way somewhere on the opposite side of the street, I noticed her, but I suddenly panicked (why?) and pretended to search on my MP3 player. It's a very wide street and chances are she didn't even notice me, but still, I feel bad about it. All I had to do was look over and wave...
And I, too, chase after insults or even sideways glances like a scientist. I tell myself straight away that it means nothing, but off it goes to the lab for breakdown. I've slowly taught myself to cut it back and the longest I'll think about it now is much less than a day.
But please don't think you're weak! Anyone fighting this is far from weak...