Has anyone had swelling, burning, and pain 8 months after TKR surgery?

I am nearly 8 months out, and have had implant checked both by surgeon and walk-in clinic. I was walking for 1 mile and a half 4 months after surgery and felt things were going as expected. But things have taken a turn for the worse.
Surgeon said things would improve over time, but now I can't walk more than a few minutes and my knee fills up with fluid. Also there is periodic burning. If I try to put a compression sleeve on it, it is very painful.
I have been told by another orthopedic surgeon I need to give it a year.
So discouraged. Any ideas would be appreciated.