What happen?

Now in class... Don know what happen, really irritated. Trying to control myself. Don know control what! Just feel like being hot-temper. But don know why. Also don know if it's because don know or if previously, i have been hiding all my feeling and emotion. Today feel very very irritated. What can i do? I feel irritated. Feel digesting. Trying to force myself to sleep but cant. I DON KNOW WHAT I"M DOING! DON KNOW WHAT TO DO!