Sounds a little bipolar to me, chances are making it to psych central means at least somethings up. But manicminer is right, get a professional dx.

From personal experience, my high school experience was similar, although i went a little manic in my senior year. College just got worse and I got into drugs and alcohol, making poor, poor choices and essentially destroying my life. I don't have any friends from either high school or college that speak to me. it's kind of sad. I got dx'd bp two weeks before college graduation and the school asked me to "withdraw" and try again next year even though my grades were fine. Every time friends would push me for a psych eval the pdocs always suspected bp and i didn't listen. but looking back i should have gotten the help i needed. oh well!
Best of luck!