I have had pain in my knee for a few weeks, on the right side & front, especially going down stairs. After I step on my left foot, bringing my right foot to the next step hurts the most. Or, walking then turning right, if I do it sharply, that hurts as well. Hurts for a bit when laying on my left side in bed, but if I lay on my stomach, knee facing the bed, it feels better. Any ideas? Thanks