Hey, Alleyyooper. You will probably wonder why you waited so long to have it done. I had my left knee replaced last June. I was grinding the bone down, so it was really bad. Like you, nothing was alleviating the pain. Since then, the right knee has been given a rest now that the left is doing it's share of the load. The right knee is feeling better. You may find that is the case with you too. Everyone is different though.
Good luck on your journey. It takes a while, but you will be glad afterwards. The relief from pain will be immediate.