Hi I am dealing with a very similar issue..
I had a work injury almost 2 years ago, pain started in my right shoulder and right arm, ultrasound showed bursitis I had 2 cortisone injections and underwent physio twice weekly for 6 months with no improvement, dr then ordered mri of shoulder and brachial plexis all results were normal. Next step was cervical mri that showed clear disc bulge, degenerative disease and spinal cord compression at c5/6 and c6/7, I had a c7 nerve root epidural which only caused the pain to worsen and spread to the right side of my neck. 12 months after original injury I underwent adfc at c6/7, waking up in icu I had the right side of face burning and tingling fast forward 6 weeks I was complaining about worsening pain to the neurosurgeon, he sent me for an EMG and nerve conduction tests which all came back normal. 3 month's after surgery I still suffer all the same pains only more severe I was diagnosed with upper quadrant CRPS 6 months post surgery. Fast forward another 6 months I now have the same burning throbbing pain down my thoracic back, right leg and into my foot. Last week I was admitted to hospital for a 7 day ketamine infusion, they suspect it may be autoimmune and did a lumbar punch to check for ms and redid EMG and nerve studies only to find permanent nerve damage at c7, im still awaiting lumbar punch results and the ketamine did nothing for the pain.
I have this week been diagnosed with right sided spinal CRPS so at present the pain specialist and neurologist are discussing either a spinal stimulator or nerve ablation as the next step

Keep advocating for yourself, and I really hope you get relief and find answers real soon xx