What kind of Knee injury have I got?

Wednesday before last, I fell over whilst I was running. My hands took most of the impact but I fell front faced onto my right knee whilst it was bent. There was no swelling at all but a little graze. The next day I had a sharp pain in my knee whenever I bent it. Sitting with my knee bent still doesn't hurt, but moving it does. I have been to see a doctor and they prescribed my with physiotherapy exercises to do for a fortnight, which i have been doing twice per day so far since Monday. However the pain- which feels as if its beneath the knee cap is still there and it won't go away. I have done minimal exercise and have been hobbling around because it hurts to climb the stairs. I have been researching my knee pain and I can't agree with any injuries I have read up about online since my knee doesnt give way. Does anyone think they can give me a second opinion and any further advice I should take?