My Husband Has Had Seizures For 25 Years Due To

my husband has had seizures for 25 years due to temporal lobe damage from encephalitis. he experiences partial complex seizures and absence seizures (lasting a few minutes). he is on kepra, Topamax, vimpat, and most recently aptiom. he also takes Namenda. we have yet to stop the seizures that occur about once every 6 weeks. any help you can give us?