I have a pain in my right knee that seems to be getting worse and I can not think of anything that I have done to have hurt it. It has been bothering me for maybe a week now. Last night I could not sleep and it's pretty uncomfortable right now. My knee feels kind of week and I think it is warm. There does not appear to be discoloration anywhere but I think there is swelling. When I bend it, it feels like it is swollen. I don't seem to find any part that hurts when I touch it but flexing it hurts and putting weight on my leg makes it hurt... It's kind of throbbing right now all the way up into my hip. It hurts to walk... Any ideas...