I am a year out and still get fatigued if I overdo too much. It's definitely a process and don't have another knee to compare it to as I've only done one and am in no hurry whatsoever to do the other. Have you tried wearing a knee sleeve. This really helps me when I know I have lots to do and am more active physically. I can do almost anything with my knee sleeve on. My fatigue has gotten much better as time has gone on but I still get tired (I'm 62 so not sure if it's the knee or age lol). I now have more good days than bad. Praying for you. During those difficult times remember as well that the Lord will provide just what you are needing when you need it. He often doesn't answer in the way that we think he should but he is always there and never leaves us and what he has in store for us is beyond anything we can imagine. Patience is definitely to one of my better virtues.