Dwelling on Negativity

There is too much negativity in the world and in my life right now. Not much, mind you, but still too much. I've been dwelling too long on things that upset me. That's not healthy. I don't know if ignoring problems is any healthier, but merely dwelling on them clearly isn't. I should decide to either do something about it or stop thinking about it. Either one would be better than what I'm doing now.