Knee and Leg pain

I had surgery on both knees a few years ago and now I’m still having problems with both of them.
They swell and become very painful.
It’s getting to the point that I can’t stand or walk for more than an hour without pain and swelling.
I also sometimes get sharp pain from my hip all the way down to my feet on both legs.
It feels like it’s in the bone, but I can’t tell.
All I know is it really hurts and I can’t stand it anymore.
My Orthopedic doctor did x-rays and they came back normal and that’s all he has done.
He gave me knee braces and sent me home.
The knee braces make the pain and swelling worse so I usually only wear them for a few hours if at all.
I just need to know if anyone has any idea what this pain and swelling could be from and what I should do next other than see another doctor which I am in the process of doing?
Any suggestions are greatly appriecated.
Thank you.