Sorry I didn't see the reply earlier. Got buried.

Even chemically induced, if you're not bipolar your body would naturally moderate the amount of mania you have. Having to take the stabilizer actually should be a flag to check again, as bipolar isn't something that once you're cleared from you don't have to worry about. I was depressive for years, but it wasn't until my 4th year in college when I had my first full on manic episode that I realized it was more than just depression.