Do I have Bipolar Disorder?

I think your symptoms could be described as mild depression as well as bipolar II. Your depression does not seem to last long which is why I call it mild depression, nor do you describe apathy or death wishes. Bipolar IIs can return to baseline, though with a certain joie de vivre, elatetedness, even if it never reaches delusions and hallutinations. The best thing to do is observe your self. Observe your highs and lows, observe what you feel, how you act during your highs and lows, note down how often they happen.Then take your notes to a psychiatrist!