Thursday, I tried to jump over a creek, and led with my left leg. When I landed, I felt a sharp pain in my leg below the knee. Friday, I had it X-rayed, and it isn't broken. It felt fine early afternoon. Friday night, the pain woke me up and was rather severe. I needed a crutch Saturday morning, but again it felt fine by early afternoon. Would you care to venture a guess as to what is wrong, and what steps I should take in order for it to heal?