Hi...I am so sorry to hear this, especially such a young person. Sounds like you have had some attention for it though no success. Did you have MRI of CT or nerve tests- -NCV/EMG? Maybe they will tell you something.
I have found lots of very useful info on Dr. Schwartz CRPS page, he is a physiatrist in South Carolina...with many different versions of CRPS...lots that seem to be related to and with further investigation into his theories, maybe some answers. Hope you can find some help and answers here. I am a new dx with CRPS also and as well looking for answers and awaiting nerve blocks. I have recently been told to see a Physiatrist a dr who treats the whole person and gets to the root of problem that is what prompted me to find Dr. Schwartz.....Good Luck and hope this is not repetitive,but helpful.