You will need an MRI on each knee to be able to identify what else beyond the bone on bone issue might be causing you pain in the knee that did not have the TKR. So your knees ache, but you do not have direct identifiable pain? Soreness would in my humble non-doctor opinion now can be managed by NSAIDs, i.e. ibuprofen (400 mg) and Tylenol (500 mg). 3 times a day. Perhaps Naproxen would prove to be better than ibuprofen because the web says it is strongest in terms of pain relief. You must have swelling in each knee, you should be doing at-home PT, mainly flexing of your legs for several minutes a day. That, in addition to getting your quadriceps strong thru exercise at a gym (weighted leg presses). What definitively does your doctor say when the opinion is that "he won't help you"? Is your doctor an orthopedic specialist?