Terry - You got lucky w/ a C2 break -- that can pretty easily be lights out, if I remember correctly.
The last month of my sentence was in the Miami J as well -- it was like house arrest b/c I could move my head very slightly, which after 3 months of practical immobility, allowed some range of motion/muscle to build up. Plus, they gave me a softer collar I could change into (while prone) to shower. DAMN after 3 months in the halo showers felt great!
I skipped PT too. When I got the word I was OK ("go forth and breakdance" or something to that effect) I pitched the J in the backseat and only wore it a couple of times to sleep when my neck was tired, so as not to unintentionally strain it rolling over or what-have-you.
I'm no doc, but 90+% of this kind of injury is just surviving the trauma w/o spinal cord damage. Having done that, your body should heal... over time. The doc's will take all the credit for your body doing its job, of course.
JP