John, thank you for your response. I've iced the knee, but that made no dofference. I've always found icing swelling hlps, but not this time. The doctor who operated retited not long after my surgery, and when this all started, the surgeon to whom he referred me told me it would go away. Not going back there. I was able to make an appointment next week for a surgeon referred by my family physician. I've always slept with a pillow under my knees or between them while lying on my side because of back issues, so that hasn't provided any relief. The replacement itself was successful, so I am flummoxed at the amount of pain so long after the surgery.
Someone recently reminded me of my extreme sensitivity to nickel. Many knee replacements, although mostly titanium, do contain some nickel. My cousin had the same problem and eventually had to get a new, nickel-free knee. I am really hoping it is not that or anything else that that requires another surgery.

I hope your swelling eventually dissapates.