I've had the memories everywhere, can't control them, too many, too much, too painfully useless, but after a lot of therapy, that has changed. It's nice and quiet now in my head, just me.
I think it is about attention; one has to learn and practicing attending to the outside "real" stuff and interacting with it instead of focusing on the inside stuff, the memories that cause arguments and spin off into other memories and scenarios like someone has thrown us into outer space among the stars.
A good book that might help is
Homeward Bounders, by Diana Wynne Jones,
http://www.amazon.com/Homeward-Bound.../dp/0064473538