How Can sharp Shooting Knee Pain Be Treated?

I bet you wont be able to answer this one!!! In September I was kneeling in my daughters room and I got a sharp excruciating pain in my right knee. I stood up and it was fine. Over the next few months this happened every time I was kneeling, any surface. I have seed our md, she had no idea what it was, but took xrays and it looked fine. I saw an orthopedist and she told me to start an exercise program, I exercise 5 days a week. I spoke with a chiropractor and he said my quads could be tight. I was at the gym yesterday and was stretching and accidentally kneeled on that knee and the pain was horrible. And when I stood up it was fine, although now in that spot but on the side it feels a little numb....