Check out allergies and food intolerance - research at Great Ormond St in the 1980's showed that many, but not all, seizures are allergy triggered, especially if there are other symptoms such as migraine, irritable bowel, asthma etc. Also get a full nutritional profile done. Deficiencies in some minerals can increase the likelihood of seizures. In particular, taking magnesium has been shown to decrease seizures. The ketogenic diet has worked for any people if you can find a dietician who understands it sufficiently. Biofeedback has also worked for some people.