That's absolutely terrible! Definitely get him tried for negligence. I am also familiar with epilepsy and lousy doctors--I'm plagued with both. One doctor is so egotistical that NOTHING he ever prescribes is "wrong" whether it is or not. He never, ever listens! I swear, I would be dead by now if I didn't get to talk to his nurse instead of him. At least his nurse actually LISTENS to people!! The other doctor is--was (my aunt finally divorced him, thank goodness!)--my own "dear" uncle. He choked his son, goes golfing on his daughter's birthday, had a hissy fit when somebody didn't save him a piece of pie, totaled the car he had gotten his son as a birthday present (it was a really, really nice one, too!), gets so doped up on painkillers he can't even work, and actually managed to make some guy go blind during a fairly simple surgery. I hoped he gets sued and locked in the slammer. And I am SOOOO glad he's not my personal doctor!
ANyway, I know what it's like to get seizures; it ain't fun. But at least I never had to watch another person go through one (during a seizure, you're not conscious to realize what's happening). My most sincere condolences on your dog--I am so sad to hear about what happened!!