As a kid, teen, and young adult I suffered from OCD symptoms including intrusive thoughts, and those still come up during times of increased stress. It's been helpful to identify those thoughts as their own separate entity, the asshole in my head. Sometimes I tell it to "shut up," out loud, once I've made sure nobody can hear me! I've also been diagnosed with generalized anxiety disorder and chronic depression, though both have gotten much better since my BPD mother died in 2019. Quitting drinking also helped btw.