I have SEVERE leg pain, behind the knee, kneecap and just above m...

I have SEVERE leg pain, behind the knee, kneecap and just above my ankle, Also my hip. This is concentrated on my right side although I do have occasional pain on the left side. My primary care doctor said it was arthritis. When I told my GYN Dr. about this, her head snapped around very quickly. She said to stop the Fosamax and start on vitamin D, calcium and vitamin E. It has been 2 weeks, and the pain is still severe. I'd like to know when it will stop. Does anyone know?