Fell down and injured my knee, swelling and possibly disrupted circulation.

[Wizard001]

Hello. I fell on my left knee about a month ago. The first week, it was painful to walk, but now I have no pain. Only I have a huge swelling above my knee. I can't bent my knee more than 90 degrees because the swelling puts great pressure on my knee and I cannot bend it any more. There is no pain, but the muscles are stiff. The swelling is not sitting directly on the knee, but rather higher up the leg than the knee. I think that oil may be coming out of the knee, and spreading into surrounding tissues and muscles. The swollen area is not black. My left foot noticeably is colder than my right one, and I think that the swelling is blocking some circulation. What should I do to help myself heal?