What could I do to maybe help this?

Heres the back story so yall know whats going on haha...
For almost 2 years now I've been in horrible horrible pain with my left knee... I in 2011 was riding with my knee like this, It was progressively getting worse and it was severely affecting my riding. I could not ride a hour with out awful pain, having my full lower leg give out and when dis-mounting just being in even more pain! I stopped riding for the winter, knee got worse... When it April I actually went to the doc bout this... Found out its a benign bone tumor in my left knee, its on the inside. It was rubbing against my hamstring cause alot of inflammation and well it wasnt helping me for sure. I did try to ride twice more... It was just even worse for me, fast forward to now... After a MRI, and seeing a surgeon we are no better... No surgery possibly and did some PT and it helped for a few months. But in all legitimacy, I can not ride. I really badly just want to ride! Its my life and its who I am!! I need help on this, please! I need some way if possible to protect my hamstring ligaments near it so when I ride the pressure doesnt cause my knee and leg to just give out. I've tried everything, Ace bandage... cushioning... other stuff! Seriously its been getting to me alot and I don't really have any good alternatives for not riding...

Have you tried a sturdy knee brace one with metal hinges? I have to use one regularly as my left knee gives out and my knee cap pops out and locks without it, on top of possible mcl sprain. Without my brace it is extremely painful to walk, with it it is better. It may help give your knee some support.
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I had to wear a hinged brace on my knee for a while when I was younger after tearin my knee up. Different situation, but my knee would give out a lot too. The brace took a lot of weight off my knee

I mean I gotta have something I can wear riding... Walkings not the issue, I can do that reasonably well now.

I wear my brace to ride as well doesnt get in my way and gives me the support I need. There are several different styles but you can pick one up for 20 bucks at walmart.
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a brace wont slow ya down. It'll take a bit to get used to, just be patient. I team roped with a brace and was fine. Heck, I ride with a prosthetic leg now.

Find somethin that will help with the pain, and you'll figure the rest out with a little patience

You might find riding Western easier on your knee. Sit the trot, no posting and learn to ride with very long stirrups

If the surgeon said no surgery possible, I'd get another opinion. A tumor does not seem like something you hsould just 'Live with".

Thanks for the recommendations everyone. And Tiny... you're right bout I shouldnt just live with it. I really don't want to and hell I mean if I pressured them enough they can do it but Id be out of doing stuff for a long time. But I gotta have some way of protecting my ligament so there is no to little pressure on it... Im not sure if a brace can help... Plus I wear tall boots.

So surgery is not possible or advisable? It may need to be done to be clear of this pain for the long term...can you get a second opinion of a sports specialist md?