I am an 35yr old woman and suffering from severe knee pain in right and noise in the left knee?

I am a very active person and going to gym for the past 3 yrs and run on the tread mill for 30 mins at 10km/hr and other work outs for another 1hr even goes on treks . suddenly for the past 2months this pain is bothering me a lot . So please anybody help me out . I don't like medication and surgeries so please suggest me something natural .