I came off my bike on black ice four weeks, and landed heavily on my right side, with my bike on top of me.
I had glorious technicolour bruising at the front and outer side of my right knee which has now largely gone, but I've still got quite a bit of pain on each side and behind my knee, especially when I bend my leg (eg when crouching down with the kids).
I'm rubbish at going to the docs, as I hate to think I'm wasting their time. If this was you, would you go and get it seen to, or are they simply likely to say rest it and take painkillers??
What would you do? I can't make up my mind!