I don't know if Gavin is a child or an adult. Have they increased his dosage yet? I am 56 years old and was just diagnosed in August of 2006. I was certainly still having seizures at that point. Have you called his doctor. I don't want to discourage you, but it took me 15 months to get to the point that I was 90 days seizure free so I could drive and I am on three seizure medications, Topamax being one of them.
I know when I started my medication, I didn't expect things to happen over-night, but at least within a few weeks. As a rule, it just doesn't usually happen that way. I am not a medical professional, just a volunteer with epilepsy.
Darren, our moderator who is on the other side of the world, will probably be along before long. I call him Mr. Epilepsy Encyclopedia. He really is knowledgeable on the subject and may be able to help you.
By the way, Welcome to HealingWell,