My rsd I think took awhile to get dx cause it did not have all the symptoms and how i got it was different too. Then I saw a couple of RSD specialists who also said you don't have to have all them to have rsd. Many of these specialists like podiatrist are not that familiar with RSD. In the start of this I became worse because of being put in an airboot and had no injury for ex. Did you say if you have been to a neuro? I think this is a key doc to preform dx tests to rule out other conditions. I have PN and RSD so sometimes there is more then 1. Also a pain doc/anesetesolgist who deals with rsd. Also you said you are going to get an injection in your knee? Is that your RSD area cause if RSD you are not supposed to inject into the area. Hang in there