first, to answer your question, optic neuritis is a typical presenting symptom for ms, but it can occur on its own.
i second what LC is saying about diet - specifically i'm curious about your zinc status from what you describe (ie having kids -pregnancy is a major zinc drain- plus eye symptoms, and brain fog).
there are a lot of known nutritional problems seen in ms patients, and zinc is a biggie (among others also very important).
from what i've seen the foods typically omitted in ms diets, like grains, sugar, alcohol, and high phytate foods, all of these foods are known zinc depleters. taking them out does allow your body to retain zinc more easily, but i prefer an approach which involves optimizing the nutrient levels using a variety of foods, and monitoring nutrient levels with bloodwork. for that to work, you need to pay careful attention to balance, rather than making sweeping cuts and removing foods we could otherwise enjoy (within limits).
if you have a peek through the following automatic links in my TIMS 'signature' you might find some info you can use.
here is a link to a site with lots of info about zinc-rich foods (and lots of other nutrients too)
if you have any questions about the nutrition side of things, feel free to ask, either here or via private message
welcome to the site!