I can only add that I have been around an aggressive epileptic dog (an English Bulldog), who bit me and my mother and would lunge at us while, I'm guessing having a seizure. He used to lick the floor constantly just before getting aggressive. Not knowing what was up he was neutered, then went to U Penn (I believe) behaviorists and then finally, he had a CAT scan at a prominent NY vet hospital where the epilepsy was diagnosed. Sadly, he developed pneumonia after the anesthesia for the procedure and died. He was quite old at the time of diagnosis, though.
Sending you lots of ((hugs)) and prayers for support and quick answer. I'll be thinking of you and your family and of course, Achilles during this tough time. Please keep us updated.