First sign of hypomania in me is that I start cleaning. If I'm cleaning like a mad man, I know it's coming/there. I also get really irritable, can't stay on topic for more than a few seconds to minutes, and don't sleep much.

The worst thing I've ever done was spend way too much money on a credit card...I'm still trying to pay that off, but thanks to my tax return, I will finally be able to!