I must confess that I would not rely on the absolute correctness of your diagnosis. Think more along the lines of symptoms. I am not diagnosed with Complex Regional Pain Syndrome, but have spinal stenosis with foraminal narrowing, osteoarthritis, et al. and have been allowed the co-diagnosis of fibromyalgia. All of this was brought about by a gall bladder infection and the resulting sepsis. If I cease taking a regular dosage of Gabapentin (and on occasion otherwise), my skin begins to tingle and then to burn. It can be sheer agony. Pain patches and cream do nothing, nor do the latest medicines that doctors proffer. I would be reluctant to try Benadril because of ties to dementia or similar. You might want to try a good CBD oil extract. Your doctor may have missed some food that you are allergic to. Stop eating processed food and food that you don't make yourself. It sounds like your autoimmune system is overreacting to the injury as a type of infection.