It's on a level a normal person would have to use meth on a regular basis to reach. When a normal person says their mind is racing, they mean they have been thinking about a lot of things lately. When a Bipolar person says their mind is racing, it means they can hardly remember what they were thinking about two seconds ago.

Bupropion is thought to be useful for Bipolar depression when taken in conjunction with a mood stabilizer. Remeron can help with treatment-resistant depression, but I don't know if it's safe to use for Bipolar.