What coud be wrong with my expression?

[blinky42]

Yesterday, I had an unusual experience and it has bothered me some. I was at work and a guy told me that I looked like I was pissed off and wanted to kill somebody. That is the opposite of how I was feeling. Then when I was sitting at my desk, the girl who sits next to me was like, "What the h*** is wrong with you. You have the most disgusted look on your face?" I was like "What?" Then to make things worse I was getting my mail outside of my house and some people drove by and screamed out, "You suck!" The worst thing though was when another group of people drove by and screamed out to me," I hate you too!" What the f***? I usually have a very placid expression on my face. I asked my son and he said, "You look like you want to take somebody's head." What could be the problem? This has never happened to me before. Help!