Fell on knee 5 years ago ,never see md, still have knee pain going downstairs,kneeling,squatting; now getting worse , aching,burning pain 24 hours day, knee getting locked at night, grounding sound,difficulty bending knee, treatment suggestion ?

See a doc for a proper evaluation. The cited injury and symptoms are not conclusive. This may be a simple self resolving problem (doubt) , one that needs physical therapy or one that needs surgery. Treatment is most often successful early before deterioration of the joint sets in.

Unclear as to extent of damage 5 yrs ago, but your current description involves at the least chondromalacia, and perhaps wear and tear beyond this. Whether the ligaments are intact is also a question. See an orthopedic surgeon, get this evaluated, discuss various therapeutic approaches.

Torn ligament +/- meniscus are likely present. Knee MRI is indicated then an orthopedist can help you.