Kathy, have you seen your general physician to see what s/he recommends? You might need x-rays and/or physio on the knee, and perhaps some medication, but your doctor should know what is and isn't safe for you, medication wise. Depending on what is found during testing, you may need surgery on the knee.
I know that one thing many doctors say you must do is build up your quad muscles, as that will help alleviate a lot of knee pain. If your muscles aren't strong enough, then they can't do their job
Good luck and i hope you're able to get some relief soon.
DX: Fibro, Severe Myofascial Pain, Chronic Pelvic Pain, Surgical Adhesions, IBS, IC-PBS, Carpal Tunnel (both wrists), FAI, Reynauds, Opthalmic Migraines, Drug Related Hot Flashes, Physically Unable to Vomit due to Nissen Surgery, Extremely tiny and scarred veins (hard start for IV's)
Meds: Oxycontin, Tramacet, Cymbalta, Cesamet, Flexeril, Clonidine plus Vitamin D + Multi daily