Ddx pain symptoms:stiffness-spine back&neck,hyperaesthesia,allodynia,paraesthesia,9/10 pain findings:undissipated central canal,few overactive reflexs

Fibromyalgia: This may well be fibromyalgia. Your physician can evaluate you and see if there's any other neurological issue that may be occurring. Fibromyalgia chronic pain syndrome with Allodynia. From the looks of your medicines you may of had this diagnosis already.

Several possibilitie: Your history is not entirely clear. I am assuming that the stiffness is only in the neck? Or the entire spine? Is there a history of fever? If so meningitis should be in the differential. Also, where are the hyperesthesia, allodynia and parresthesia complaints present? I am assuming in the limbs limbs possibly. If so, central nervous conditions should be entertaihed such as MS or T myelitis.