can someone help me sort this out?

one of my MDs is suggesting that I may have a form of Devics disease, and not a true MS.

1. I hiccup all the time.
2. I have frequent unrelenting bouts of nausea.
3. many of my attacks occur on my optic nerve
4. I am positive for Sjoghrens.

im confused. My ANA is negative, my spinal MRI years ago was negative, but I do have increasing sx of spinal involvement such as the severe ms hug, and the hiccups.

The eye surgeon said that MS that constantly attacks the optic nerve is not a "true MS" but would be a variant of the disease called "devics" Anyone care to help me shed some light on this?