sounds like patello femoral pain syndrome... go see a doctor in sports medicine and he'll likely recommend 4-6 weeks of P.T. of soft tissue work. Also strengthening to get rid of any muscle imbalances you have.

If you can't afford P.T. atleast get a screening and he/she(the therapist) will be able to tell you what needs to be done.

also you won't see results over night. it could take a few months to fully recovery. You'll likely start seeing results after the 6 week mark.

Good luck.