Please go see another doctor (preferably one that is CRPS knowledgable and who has seen this before). If s/he says it's not, believe her or him: it's not. Do not self-diagnose. CRPS is a difficult diagnosis as it is. You might notice symptoms, but it is up to doctors to connect the dots.

A knee is a difficult joint, in that there are lots of "systems" in a tight spot, like nerves, bone, cartilage, so what you have might need healing and might mimic all sorts of things, that doesn't mean it's RSD. It also doesn't mean that it isn't.

Good luck.

I hope someone can chime in with a doc recommendation close to where you are.

If not, go to a pain clinic. Pain clinics are very experienced with RSD!