I would agree that you need to see a neurologist. You have mentioned a MRI of the brain and thoracic spine. I assume you also had a MRI of the cervical spine. With your face and body symptoms, I would assume there is a problem within the cervical cord or higher. The neurologist will need to review the films, and then proceed from there. Blood tests for inflammatory markers, vitamin B12, folate, and thyroid function may be checked. Depending on these results further tests may be needed. Good luck.