I have extreme inner knee pain of my right knee. No swelling. I cannot bend or straighten my knee without sharp pain. Started Saturday night as a result of having my knee bent in one position for an about 90-100 minutes. I am 61 years old. Started taking 500mg Naproxin last night (1 every 12 hours). so far no relief of pain. I will ice tonight. I was going to let the pain subside & go to a physical therapist. Would I be better off going now? Any other suggestions for relieving the pain? Is this bursitis?