I'd agree that it is best to be evaluated by a psychologist or psychiatrist. It could be bipolar II or something else.

I am bipolar II. I will say that it is very easy to write off hypomania as normal mood or just being in a good mood. It comes out differently from person to person. I didn't really think bipolar fit me until I took my psychiatrist's evaluation. I just thought I had depression and then periods of good mood and motivation. Hypomania can also come out as irritability and anxiousness too.