It doesn't have to be a ghost to haunt you.
It can be good, or bad, memories that visit your mind at inopportune moments.
This week, I have been plagued by ghosts...things conjured from my memory that have long been thought dead. I remembered some stuff that crept out of the depths from my childhood. I wanted to talk to someone about these thoughts, but there was no one who would either remember or give a rat's ass about what I was thinking.
That's the trouble with odd memories. Good or bad, sometimes they are just your own and therein lies the problem. You might be able to unload them if there was someone to share the pain or joy. But, no. They lie in wait for you to shut your eyes and hope for sleep without dreams, or nightmares.
That's when these memories spring up and spill over you.
Most of the time--they hurt.