My heart goes out to you
But I have to say I agreed with the others... Could his seizures and aggression be linked and your vet is just not fully aware of this type issue?!?!? Or did the biting start after the meds, could that be it?!?!? Does he even walk into stuff could it maybe be his eyesight since seizures can affect eyesight and he fear bites?!?!?!?