Just want to thank you all for contributing to this thread. I too am 24 years old experiencing PCS/acute stress disorder after a concussion to the center back of my head with almost identical symptoms to OP, but am only three weeks post injury. The worst symptoms are insomnia, anxiety attacks during sleep and when I'm tired, and occasional fogginess/derealization (fortunately I have good stretches of several hours where the latter feelings are gone). I would love to hear a follow-up from any of you guys to give me some hope for recovery.