two nights ago I was laying on the couch watching television. I stood up and took a step and it felt like my left leg was asleep, very weak. The step was extremely painful and felt like a something pulled or stretched. For the past two days my left leg feels stiff, and when I take a step or put weight on it, my leg is weak and I nearly fall, and the pain is extreme. After I limp around it goes away and doesn t happen anymore. I went to the gym two times since the original injury, and have walked around 90 minutes on a tread mill and ski machine without incident, then 1/2 hour ago I nearly fell in office from simple weight being applied while standing. This is strange.