Bad knee/ankle pain after running?

Both knee and ankle hurt during my run, and i cant sprint because of the pain. then, after i stop running, i get a horrible pain in my knee that shoots down my leg and into my ankle. it doesnt feel like a muscle, and its been hurting about a week and 1/2. it hurts on the inside of my knee mostly, by the kneecap, and also a little on the top part. my foot hurts around ankle and back of heel. ive been icing for a while, but it doesnt seem to help much once i start running again. please help? do u know what it is or how i can ease the pain?