Hi.. Your knee pain may be due to muscle imbalance ..that is you calf muscle could have gone tight due to some reason...which in turn could have load front thigh muscles...which is the reason for the noise and pain as patella is subjected to pressure due to tight thigh muscles.. I suggest you to kindly do icing frequently around knee.. u can wrap it up around the knee for a while..slightly knead the tender areas around the patella and inner and outer aspects of knee..and stretch quads by bending your knee  touching your heel to butt till you can tolerate pain... Once pain comes down u can start rehab program...to increase strength and reduce imbalance...