Usually, I experience the same thing, but instead of anxious thoughts, it's violent thoughts. I keep thinking "If he insults me/If he laughs at me/If he tries to degrade me, I will kill him", and I usually just stare into their eyes while the uncalled-for hate broils inside me and they get far away. I think of so many horrible things to do to them, and it doesn't cause me anxiety or anything after the person's gone (but when my mind clears up, I think "Whoa, I almost went crazy" and dwell on the subject). I have a set period in which I fall into these moods, which is like a few weeks/months, then tranquility and energy. But, heh, I'm probably bipolar.

These anger attacks don't have a cause, either. I might be walking down the sidewalk after saying "Hi!" to a friend and laughing around, then all of a sudden I get this horrible anger and hope someone attacks me so I can destroy them and still have an excuse to get away with it.

By the way, I'm a college student too!