This thread might be of some help:
http://neurotalk.psychcentral.com/thread164040-3.html
I am 3 1/2 years out and nowhere near recovered, but I have come a long way from where I was at my worst. Looking back, I too do not know how I made it through it. This forum helped, as did knowing that there are people in the world (my family) who need me to stay alive, no matter what. I had also already been through hell with my OCD and CFS prior to the injury, so having made it through that, I suppose I knew that I was resilient enough to survive this too.
I still have very dark days in which I don't know how I have managed to survive for so long. I still have a long way to go, but my symptoms have very gradually gotten more manageable, and I keep discovering additional ways of working around them.
Peace