Have you been tested for sjogren's? You said you started b shots. What was your level before? It can take time for nerves to heal and deficiencies to get better. What dose of Cymbalta are you on? I ask cause I was on too low of a dose to start off with. Did your doc give you as needed meds? Sometimes a combo of meds like Cymbalta are needed. I know at one time I could not tolerate neurontin but then tried it again a few years later but started very slow to lessen side effects. You stated you had an mri of the back but what about the brain? I am sorry I wish I had more answers for you but I would talk to your doc about as needed meds or adding/changing to the current