Feeling better
I have decided to rest my right leg at least until the end of the week, but it is getting better. A trip to the doctor's office eased my fears a bit, and I at least know I will start the marathon. How far I go will depend largely on how I feel.
But I have a preliminary diagnosis that makes me feel better.
It looks as though the injury was to a ligament or tendon, and much of the soreness is now near my Achilles. Another positive sign is there is not as much pain as there is soreness, so I will ice it and try to stay off it as much as possible.