Happens to me too. Then I can't let the thought go and I rumination. My psychologist gave me a tool to use when I get like that. She said to visualize a container with a lid (mine is a blue ceramic jar with a cork lid). When the thoughts come open the container and put the thought inside it and put on the lid. Know that if you really need to you can take the worry out again. I find I have to do it over and over until it works.