I'd ask how much experience with CRPS they have.

What treatments, procedures, meds, and therapies s/he will prescribe? Such as: Does s/he offer Ketamine infusions? Does s/he perform blocks? Does s/he have an opinion about warm water therapy? Has s/he prescribed Low Dose Naltrexone? If other meds are unsuccessful and if every other option has been exhausted, will s/he explore the possibility of prescribing Extended Release opiates?

And so on... Good luck!