Occipital lobe epilepsy

My 12 yr old son is typical, but has OLE.  He would like to know if anyone else has this type of seizure his age.  They are intractable, so far.  Has anyone had luck with medications?  he is on Keppra, has tried lamictal-discontinued due to rash, topamax is causing cognitive slowing. Triliptal is next on the list.