Hi, there, and Welcome! I can't believe this got by without anybody answering. My apologies!
Seizures! Wow! Scary!! They're not completely unheard of in MS, though, as we're twice as likely to get them as the general population. But that's 5-6% as compared to 3% of the general population.
I snagged this from the MS Foundation site:
One of the less common problems associated with MS is seizures.