Hi, I'm 32, and I work 5 days a week always on my feet. I slipped fairly hard at work today, not 4 1/2 hours ago. I drove home experiencing some pain in my left knee. Now I'm experiencing pain alongside the outside of my left knee (with swelling), my hip, and the back of my calf. I've attempted walking on it, the pain seems to start either in my knee or hip and radiates alongside the back of my calf. My leg feels like it's buckling and I'm going to fall again.