Now I've done it.

Since last Thursday, a week now, I've had a terrific pain in my left hip. Note that this started hurting AFTER all of the muscle soreness was gone from the marathon. But it had been nagging for a few weeks. The worst symptom was that I couldn't extend my left leg very well. It was like my left hamstring was an inch too short.

Anyway, went to the doc yesterday after deciding that it wasn't getting any better with stretching and no running. His best guess is a stress fracture.