I have the problem where today I've had a brilliant day at school. For once I didn't feel too bad, I was able to concentrate... I say I could concentrate, not until English where my teacher talked about a man getting shot and I had the urges to harm. I ended up scratching away at my skin until it started to bleed.
Soon after I was put in a better mood and then while drawing I felt ridiculously down for no reason and ended up drawing really depressing figures. I'm feeling so much better now though...

Does anyone have these sorts of mood changes too? Also do they happen so quickly as they changed in the space of an hour...