Why ruminating is bad for you.

http://psychcentral.com/blog/archives/2011/01/20/why-ruminating-is-unhealthy-and-how-to-stop/

When I was young I used to ruminate or brood.Looking back it made me feel terrible.But  thinking is not the same as ruminating.And neither change our reality unless we act.To stop ruminating it may be enough to say it does not usually help when you feel down.Then maybe take a walk,look at the world of nature.Try talking to a kind friend instead if you can.