Well sorry to hear that, I dont think that there is much that you can really do but just be there for him, its hard for him I know I am also epileptic and I have moodswings also. Maybe when he is like that to you, you could just talk to him and try to calm him down. I know it helps me when my partner does this with me I am on epilim also and it makes me have terrible mood swings and its also bad in the morning when I am waking up I am the worst. Maybe he should talk to his neurologist about switching his meds.