How do you get someone out of your head?

[Myturnatlast]

It's my ExH. We split up over 6 years ago and have both moved on. I barely see him and we only message occasionally about our daughter, who is 18 now.
He's started chasing me for money that he thinks I owe him (I don't) so I've blocked him on absolutely everything and decided not to think about it unless he takes me to court (he won't, he's too idle to bother).
It's easier said than done though, I barely slept last night and am worried that he'll turn up at my house so am planning extra security but I still can't get him out of my head. He doesn't deserve any of my time so it's annoying that he's getting it...
How do I stop thinking about this? I'm so happy with the rest of my life right now I'm getting on my own nerves!

That's tough. It sounds like you are a bit fearful of your ex. Is he volatile? To get it out of your head maybe write an action plan. Like what if he comes to my house? Will I call the police? Once you've written down an action pkan fold it up and keep it somewhere safe. You can store your worries there while the situation unfolds.