I know exactly what you're going through! I used to work for "Country Wide Home Loans." When my seizures started up in the middle of working for them, they just decided to lay me off. But as for telling an employer in an interview, that can go 2 ways. #1, don't tell them, and when they see your seizures while you're working. Then they don't have the right to fire you. You can take them to court. But that's to get your job back and all the pay checks you have missed since they fired or laid you off.
#2, Tell them about them during the interview. Then if they accept you, you can see they are a pretty decent company in accepting problems.

Sincerely
shawn33