Get used to the fear, the thought.
Do something over and over where you expose yourself to the thought and or feeling until your brain tells you it is bored of it.
When your brain is bored with it, it will stop intruding.
Put the intrusive thought to song, interpretive dance, poem about it. Short story etc. Record it and play it back until you are quite bored. Write a play, translate it but keep it in your awareness, pressing that button and exciting your brain until your brain begs you to focus on something else.
One person suggested putting up sticky notes about it, repeat it in front of your mirror.
You will naturally turn your attention to more interesting things.