There is a veterinarian who has treated canine epilepsy with diet and advocates a gluten free casien free diet for same (in both dogs and humans). His GARD diet (a modified GFCF diet) is only just starting to be studied clinically, but he has anecdotal evidence of success from people who have tried it.

My wife tried it and did not have good results, but it might be different for you if you have a severe reaction to dairy.

See:
http://dogtorj.tripod.com/id16.html for more details.