Suggest Treatment For Pain In The Knee And Leg

Im 27 yr old women. I have pain in my knee's right side and above the knee, and in buttocks of my right leg, for the past two years. Im not sure about the pain , if it is in muscle or bone.If the pain comes, im not able to give movement to my leg. When i consulted doctors, they said its due to weakness and asked to me take iron, vitamin E and calcium tablets. Im also taking for 2 years. But i find no improvemnt. Also i got delivered 6 months back.