I've said it before and it is a mantra worth re-visiting. Do you ever get hung up on something that went wrong and simply continue to play back the tape of that scene in your mind? I did this morning. When I was done ranting and desired to let it go, I still had a difficult time doing so. Then I relied on a trusty visualization that generally works very well for me.
I imagine the problem or challenge wrapped inside a helium balloon and then allow it to drift away. Today, the balloon that came to me was black in color and so weighty that it could barely take off. I stuck with my visualization and was finally able to release my feelings around the challenge. Later today, I even laughed about it.