I don't know much about it but can tell you that it is complex and not fully understood. A simple search described (CRPS) as, "a chronic pain condition that affects limbs and is characterized by persistent, severe pain that's disproportionate to the injury"
I can share a story that may or may not be of interest. My sister's mother in law, very tragically lost her daughter, who had only recently had her first child. As I am sure you can relate to, her grief was tremendous. Within days of the death of her daughter she experienced extreme debilitating sudden and complex symptoms that were medically confusing. She was hospitalised and remained poorly for some time. As time went by the symptoms gradually receded and she is now back to her former self.
The reason, I'm sharing this story is that my very limited understanding of Complex Regional Pain is that stress can be a trigger. It is however far too complex for me to add anything concrete or meaningful. Merely to prod your medical team and ask if they think that your current emotional trauma could be a significant factor.