Thanks, Bob.
I am currently able to work at a computer for 5 hours, slowly improving. The doc is a bicyclist, so he may be on my side on the rehab part. If not, I will ignore him.
As for what happened: In a nutshell, I going east on an open road in Franklin and was rear-ended by a person who did not see me. It was early and the sun was probably in her eyes. I felt I was in the proper place in the road, about 2 feet to the left of the margin line.
Possible risk amelioration: 1. Don't ride when the sun is so low. 2. Get a tail light. 3. Ride closer to the edge (has its own risks). 4. Ride in Rutherford County 5. Don't ride (unacceptable)