hi there,

you don't have to pay serious money, this is just a suggestion that I found to be surprisingly sound.

To deal with intrusive thoughts (what she calls them) T recommends the following:
Set an alarm or timer for ten minutes and tell yourself firmly, "OK, I am going to think think think about this for ten minutes only, and that's it."
Start the timer and go.
When time is up, stop.

I didn't believe that it could work and said so. but the next time it came up, I tried it and it did...... wooooo... sneeeeeeky therapists......