Excellent advice in Advice Not Given’ by Mark Epstein. From his excellent chapter ‘Right Action’, some ideas to help with troubling thoughts.
When we help people see their repetitive thoughts as mere thoughts rather than as true stories, there is a whiff of freedom. Our narratives need not be as sure of themselves as we have led ourselves to believe. The more we examine them in an open way, the less convinced we tend to be about them.
… But letting go does not mean releasing the thing that is bothering you. Trying to get rid of it only makes it stronger. Letting go has more to do with patience than it does with release.
… [In] Right Action … You settle into yourself rather than trying to make the troubling thing go away. If anything drops away, it does so by itself. You cannot make it happen directly.
Right Action is part of the Eight-fold Path from the Buddha’s fourth Noble Truth