Yes, the mind is complex. What I find extremely useful in this instance is to journal. Writing out my thoughts - getting them down on paper. It helps create some distance and offers a new perspective. I'm not so blended with what's been going on in my head.
Normally the thoughts will have some origin story and/ or there will be a familiar theme, a familiar energy.
It's about being able to sit with the discomfort, acknowledge it and this helps to allow it to pass.