I think there's a trick to this.
Well, generally, if something keeps clogging your mind, and there's
nothing you can do about it.
Divert your attention to something else.
Play a game, read a book. No matter how ineffective it is, just do
it.
If he comes up in your thoughts after a while, find another
activity to do, or sleep.
This way, at least you have lost a few hours doing something else,
and save yourself a few hours of grief.
Jia you Icy Jie~