During a run yesterday, my calf felt like it popped. Seems to be on the back outside of my calf. The spot where the pain is feels like a very small football in outside of the calf. The calf is swollen and today my ankle is black and blue and bloated - no pain in the ankle though. Can anyone shed some light on what I might have done? I can walk flatfooted but can't extend up on my toes if I try to run.