do I have a sprained knee?!

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I dont know, do you?

Symptoms of a sprained knee generally depend on the ligament involved. In most cases, however, a sprain to a knee ligament will be painful and cause swelling. There are three grades of sprain, and the severity of the symptoms will vary depending on the grade. An athlete or physically active person may sometimes feel unstable on the joint and may find that the knee buckles sideways. Other symptoms include tenderness, bruising, and stiffness.

http://www.wisegeek.com/what-are-the-sym…

If it happened a while ago, most likely you damaged the cartilage in your knee and it will do that for the rest of you life- unless you get it looked at. Go see a doctor, get some x-rays and try to KEEP from bending it too much until the pain stops.