If your feeling of Derealization was caused by your head trama directly, it would have shown by now as your brain's inability to apply emotion to your surrounding environment, sights, sounds, ect. I do not think this is the case with you. I think it was simply your brain's attempt at protecting itself. It will pass, make your life as friendly as possible, so you can take down your guard.

I was just rereading your post, and this part of it I didn't really understand. Are you saying the derealization isn't caused by head trauma? I never had this problem before and I personally think it has something to do with the fact my brain has been injured.

I started feeling better, then about 5 minutes ago it hit me again..it feels so weird when it hits, like I'm stepping outside of my mind or something. Very very scary. I've been doing nothing but resting the past couple days, so I have no idea why it's happening. I'm still trying to figure out if it's DP/DR or something more serious like permanent brain damage. I've been frantically searching online for...something. PCS is such a roller-coaster, I swear.