Let it flow, let it go
I do a little exercise sometimes where I imagine I'm blowing up a balloon with all the things that are stressing me at that moment. I close my eyes and with each breath I send another one of the stressful thoughts into the balloon. When I feel I've got them all out and filled up the balloon I imagine letting it go to—up, up and away. And then I breath a deep sigh of relief! It's not a meditation per se, but it can help.