I Just Can't Get You Out of My Head ... Dammit

Is there a term for when memories, thoughts, regrets, etc., get stuck in your head the same way a song does? And more importantly, is there a way to get them to shut up?

I've got a few things in my mental closets that keep jumping out and shouting "Boo!" at me, and I really want them to bugger off. :P Suggestions (that don't involve drugs or alcohol, please) welcome.

-The Gneech