Seizures are technically more prevalent in MS than in the general population but having said that, seizures are still basically one of the rare MS issues with varying stats ranging from 1-4% so if you are having true seizures, it's likely there is something else that is going on....
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2748351/
Cheers.....JJ
Seizures are not common but they can happen. They would have to do an EEG to check.
Alex