Something I didn't say before... IT'S NOT EASY. Learning to let go is a skill. It takes practice and repetition. It's something you'll have to develop on your own, or work with a therapist to develop the skills. One thing that works for me is that I recognize when I am dwelling on something. I refer to this as "wrong-think." So then I process it. Have I already put this to bed? No? Then when will I? I make an appointment to do so. If I already have put this to bed, then I tell myself to stop. Just stop. All I am doing is needling myself. I wouldn't treat anyone else as poorly as I am treating myself. Getting yourself out of vicious thought cycles can be done, but it takes practice. Why am I thinking about this? STOP. I have already wasted all the energy I am going to on this. It serves no purpose. TLDR; It takes practice to make yourself STOP when your head is turned around.