I got a charlie horse in my left foot yesterday after working a 7 hour shift at work, I was on my feet the whole time. Now, I couldn't walk off the charlie horse, but after a little while it turned into this pain when I stepped down. It hurts very badly, I can barely walk. It no longer feels like a tight muscle, but something more. Could this be a stress fracture? What can I do to relieve the pain? It only hurts when I walk (step down, roll forward.)

Thanks...