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You could be having fluid collection around the knee due to arthritis or bursitis
which is causing occasional pain on movement. Your jaw problem could be due to TMJ arthritis
, especially if you hear clicking sound sometimes on talking or chewing food. You should get examined for possible autoimmune connective disorders like Rheumatoid arthritis
soon before it gets too late. You can take pain killer like Paracetamol
under medical supervision for these pains but you need to get a thorough checkup to rule out arthritis. Eat healthy. Eat plenty of fresh fruits and green leafy vegetables. Drink plenty of water. Exercise daily to keep fit.