Like you, I think I'm normally a very optimistic person, but since 2-3 years it happens I have some "not-so-optimistic" days and my level of feelings of stress and chaos is high. When the level is so high my mind seems to turn off itself and I feel myself like a sort of slow sloth. I know it's because I lived some personal bad events in the last years and everything it happens around us not help me to stay up. Sometimes I think I could spend some days out of the screens to rebalance everything,
but at the end to use my brushes and colors are a good way to restorate myself . That book seems to be interesting to read, maybe it can help me too. ^_