I started seroquel about five days ago and I have found relief from exactly what you are talking about for the first time in my life. The funny part (or not funny part, really) is that I didn't realize it was a problem until I started the seroquel. I just thought that's how I was, racing from one idea to the next in my head, I figured it was anxiety (I was dx with generalized anxiety disorder many many years ago, which was probably bipolar in retrospect). I don't feel drugged, just calm and able to think more clearly. I kind of love it as my job is very fast paced and detail oriented and the racing thoughts really made it hard for me at times.

Also working out! Burning off the racing thoughts seems to work for me, sometimes.