Have you ever looked into stoicism as a philosophy? It's not for everyone, But I find it to be useful. There is some evidence that optimism can actually be counterproductive, while indifferent acceptance of the world the way it is can be helpful.

The hard part is the indifference vs strong emotional reactions. Stoicism teaches that one can back away from the immediate reactions and think about what is going on while using the rational, reasonable side of our brains.