Have you heard the term electroencephalography (EEG)? An electroencephalograph is an instrument that shows a record of the electrical activity of the brain. By attaching electrodes to the scalp, a graphic record of brain waves are recorded and analyzed.
By this method, Doctors can identify just what exactly is triggering seizures, whether if it is epilepsy or some other neurological disorder.
If your husband's seizures are paroxysmal (nonepileptic), the EEG will pinpoint the actual existing problem.
I am studying neurology and in it I have learned much about EEG and the results thereof. I'd ask your doctor about this method.
Patrick