I also had my right knee replaced 7 years ago. I had problems with pain immediately after. I did everything that could be done medically and found no relief until one doctor suggested knee ablation and it worked, I now go in about every 10-12 months and have it done. They burn the nerves that are causing the pain signal to your brain nerves do grow back which is the reason for the repeat. Instant relief and for a couple of days your knee will be bruised but your awake for the procedure and can walk away right after.
I highly recommend as I have had great results. Stay Strong it will get better