I have periods of feeling good which I realise are more significant than merely being happy. Hypomania for me seems to have a drive to it. Often though I don't realise this has been so until after the fact in hindsight.

For me there is a marked difference between hypomania and all out mania. When I am hypomanic I do not engage in risky behavior, nor do I have delusions of grandeur. But what I do experience is the need for activity and thirst to charge my life with fun.