I personally haven't seen mention of bisphophonates for late stage recalcitrant CRPS.

Here is an article summary by M. Varenna who is responsible for the Italian research that brought us neridronate. Varenna states that in most studies these drugs are useful early on and actually may not work as well in long standing disease. Neridronate is currently in US safety trials.

Bisphosphonates in Complex Regional Pain syndrome type I: how do they work? - Abstract - Europe PMC

It is my understanding that calcitonin use has fallen out of favor. The FDA here has prohibited it from being marketed due to cancer risk.

Becca, I hope you get what you need.