Something else I experience when hypomanic is a dizzy floaty feeling. Ideas often become stronger than external stimuli. I'll have a blissful euphoric passion for all these new revelations that come streaming into my mind, and get caught up in the prospects for something really awesome and earth embracing that will come out of my new ideas. People talking to me are almost ignored - I try to listen, but I just can't keep my focus on them because they are fuzzy and far away, while my ideas are bright, colourful, and very real.
At other times, I get overwhelmed by sounds around me, and find it incredibly difficult to think - everything becomes confusing, and I become highly agitated.
Both these experiences I have quite commonly with hypomania.