Had my head hit in a car accident. Jumped off the driver seat and got my head banged towards the frontal pane. That was in the very end of 2007. Since then I developed agoraphobia. However, I have been having dp for three years. Don't know if there's a connection between dp and head injuries. It wasn't a simple hit. I have stitches in that area. And bin having a non stopping headaches for almost a year now. If you have some progress about your condition, tell us about it if it's linked to a head injury.