OMG, Holly, I could have written that entire story--minus the success on the Wellbutrin. I also have been misdiagnosed as major depression since I was a kid, although, like you, exhibited MANY signs of being a bipolar child. I JUST got diagnosed as bipolar II last month, FINALLY, and it came as such a relief. But all those things that you find yourself doing, passing people on the road--I almost have a phobic reaction to being blocked inbetween cars and have to get out of it quickly--and the rage, taking on too many projects at once, and school, same thing. I did 15 credit hours while working full time, and when at work, I would take on enormous loads of work and get it done, but then couldn't keep up the pace once the hypomanic stage passed. It was awful. I finally ended up quitting my job after a close nervous breakdown, which led me to the pdoc and then to my diagnosis. I would definitely keep that appointment and tell your doctor everything, and your suspicions about being bipolar, because you definitely sound bipolar to me, but probably bipolar II, like I am, because you don't have the severe symptoms of psychosis during your manic episodes like some bipolar I cases.
Hope this helps, and welcome to the board!