knee injury

I fell on my left knee nearly five weeks ago, I have seen a general practitioner and had x-rays. There were no broken bones and I was diagnosed with muscle strain and severe bruising. However after five weeks there is still pain on either side of my knee as well as across the top of my knee-cap. There is still burning and stinging and my leg swells all the way down into my foot. Ihave taken Skelaxin for several weeks and been on limited activity, help!! What could this be and what do I do next. Thanks