Hi there..you have diabetes, you haven't mentioned about what treatment your taking for it...if you taking then the medications your taking are not working as your sugars are still high..please consult diabetologist for change of medications and dietician for diabetic diet advice.. And knee pain could be due to many causes like fracture of patella, joint disorders and, ligaments tear, bursitis, osteoarthritis, rheumatoid arthritis, septic arthritis.... home remedies to reduce pain are hot fomentation, application of gels containing diclofenac, knee brace, avoid putting pressure over the knee which is paining, avoid sitting down.. please consult orthopedician once..