Thought I had just slept funny on my knee. I woke up 3 days ago now with a very painfully knee. Could barely get up to walk on, going down the stairs, bending it at all even to sit down on the toilet have become painful (let a lone walking downstairs!). I definitely didn't injure it, haven't been to gym this week due to strep throat. What scares me is that it's been almost 8 weeks since I had a rude awakening with a sore foot. Just found out yesterday its a stress fracture on my foot. Are the 2 related? Am I suffering from some sort of major discease or arthritis??? It hurts so bad I don't want to get up