If this is your initial episode of symptoms is very difficult to definitively separate Devic's disease from optic neuritis due to Multiplex sclerosis.
Painful eye movements is characteristic for optic neuritis in both conditions.
Shaky tongue or tremor, and "shaky look on side" or nystagmus (involuntary eye movements), can be found in Devic's and MS, too.
You need to be performed brain MRI and checked for changes in your cerebrospinal liquor, to get the proper diagnosis.