I usually self-harm when in a mixed state. Lots of energy, agitated, ruminating on the past. That doesn't sound like what you're going through.

Mood changes lasting a few days is pretty common in bp. It seems to me that your current med regimen needs re-evaluated.

As for hypomanic vs good mood; When hypomanic, I obsess over things, get extremely talkative, joke telling at inappropriate times, grandiose idea of what I can do (nothing can stop me. I can raise a mountain, or tear down a house with my bare hands). A good mood for me is typically when I don't have any depressive symptoms and am not flying off the rails with excess energy.

FWIW, I think it would be a good idea to talk with your pdoc about your medications. Best of luck to you.