I would say it is just your perception being a bit off because you are hypomanic. They may be thinking wow shes in a especially great mood but Im sure that they are not thinking anything bad. Being perky at work is a good thing. Other co workers may actually envy the fact you are so happy with your life that you can be that way at work. I found thats how it was when I was working and hypomanic others were actually jealous of my performance and output at work and the fact that I could work circles around them with little effort and they were drained. This was an office with only 17women, no men. Too much estrogen to begin with. One of them actually accused me of being on drugs..... Ha ha I was manic as hell. If only I could have said my euphoria is better than any damn drug you could ever buy, and yes Im high but not on drugs. Its funny some people are actually envious of this disease. They just dont know exactly how hard my very lows can get though and they never will.