I Hope It Isn't Serious!

I don't know how, but apparently my left knee is all screwed up. It was feeling fine all week but out of the blue I go and exercise and some crap like this happens to ruin my weekend. I ran a few miles yesterday morning and my knee started to ache. After a few hours of rest it felt fine again so I decided to play some basketball. BAD IDEA! That put my knee in some really bad pain and left me limping around in pain for the rest of the night. Im not sure what could have injured it but there is a sharp pain on the outside of my knee when I do certain things, which is really really annoying. I guess I'm going to have to rest it for a week and see how it is next weekend. Hopefully I won't have to see the doctor.