heya, the only thing i can come up with from my angle, is a bit of sensory ataxia (loss of position sense).
ataxia has been linked in research to vitamin E deficiency.
when i had my most remarkable recovery post dx attack, it was on a megadose regimen involving lots of b-complex, lecithin, and vitamin E.
on day 3 my position sense returned.
i did not have any testing done for vitamin e so i don't know for sure what happened. i also don't know if the problems i had with my hand are at all similar to what you're going through with your tongue...
something you could try is eating lots of sunflower seeds and using sunflower oil for salad dressing. if you choose to go the supplement route you could take vitamin e but make sure it is an E8 complex - regular vit E supplements are alpha tocopherol, and taking that form alone drives down your beta tocopherol (a potent cancer fighter).
the regimen i was on was quite high therapeutic doses, 800IU four times a day. now i usually take 400IU E8 complex per day plus use sunflower oil and seeds on my salad at suppertime.
just a thought, don't know if it's relevant...