For children who don't respond to medications, Dr.s will sometimes prescribe a ketogenic diet (http://www.epilepsy.com/learn/treating-seizures-and-epilepsy/dietary-therapies/ketogenic-diet), A ketogenic diet is a diet high in fat content and is usually reserved for epilepsy patients that have tried two anti-convulsant medications without relief from seizures. Ketogenic diets seem to alter brain function and decrease seizure activity. This is usually reserved for children, but may be worth speaking to your Dr. about.
At this time, there are no firm studies showing foods to help with adult seizures. It is recommended to maintain a well-balanced diet, limit alcohol, and get plenty of sleep. There is some promising research on the benefits of yoga.
Please discuss specifics with your neurologist.