hmmm seems as if no-one wants to touch this post, I have a couple of questions for you:

1. Was there an incident you remember that kicked off this last episode of pain (6 months ago)?

2. Do the symptoms appear only after physical exertion, or can they appear at anytime, randomly?

3. Are there any other areas on your body that get painful to a lesser or greater extent, or change in their appearance, i.e dryness, itching or lumps and bumps etc which coincide with the onset of pain in your knee/s?

You have done the right thing by booking in with a specialist. Seeing as though you have seen a few docs already I guess they would have already looked into things like Gout and Rheumatoid arthritis and the normal musculoskeletal possibilities for the source of your pain. although from my knowledge your symptoms don't fit perfectly with RA or Gout but there is always an exception to the rule. maybe do some research on these two and if it seems to fit bring it up at your next appointment. I'm an early stage student still so I may be way off but I could see you were left hanging there so I thought I'd give it a crack.

all the best,

SST