Kathi as far as your neurologist changing your diagnosis to central pain syndrome, from small fiber PN, isnt your pain caused because of damage to your small nerve fibers? You may also have central pain syndrome but wouldnt you also have small fiber neuropathy? The two do not seem to me mutually exclusive to me. For instance, if you broke your tibia and this set off a central pain syndrome (rsd), you would still have the broken broken bone until it heals or if it heals and also would have central pain syndrome.