UHG- I have combat PTSD and I suffer from really intrusive thoughts. I say a lot of mantras. All day long. And most of the night It actually is starting to help me.

Sometimes positive thoughts are impossible, I know. So I'll just say something simple like: "I am right here. I am taking a breath". Or I'll recite a nursery rhyme. Anything to break that downward cycle. I can go back to it later (in t, maybe) but this is just to learn a new thought habit.