Severe Seizures. What else should i try?

My mother has been having dissociative seizures daily for the past 6 months. We got her evaluated by neurologist. Ct scan and Video eeg came normal. During an episode, she suddenly closes her eyes, becomes completely unresponsive, her right hand shakes, followed by heavy complete body shaking jumping hurting herself unknowingly and side-to-side head movements for 20 mins. She does not respond to sound or touch throughout the episode. She has also been seeing black shadows and hearing whispers once or twice a day. She has been under psychiatric treatment for 5 months. Previous medications (Daxid 50 mg and Quetiapine 25 mg) did not help. Now taking Duvanta 20 mg (afternoon), Duvanta 30 mg (night), and Zolfresh 10 mg (night). The hallucination-like symptoms have reduced, but the seizures remain unchanged not even 1% reduced. She is also unable to sleep without medication. Is this condition treatable? i want her to be cured doctors. What else should i try ? please help me find a solution.