Thanks everybody.
He made it through the night quite uneventfully. His seizures only have happened when he's sleeping, so I was scared going to bed. We were both exhausted and slept like rocks. I woke up around 3:30 and he hadn't moved at all, so I'm pretty sure I didn't sleep through any.
Yay for drugs!
He still has his iv catheter in, and I'll keep it in for a couple more days just in case. Hopefully we won't need it anymore. He's sorta drunk from the phenobarbitol he's now on, and he's drinking and peeing like a mad man (that's an awesome side effect in a dog that's already having drinking/peeing issues!!) but I'll take that over seizures any day, yanno?
Bloodwork has all been normal. CBC, chemistry, ACTH stim (to rule out Cushing's disease), urine protein:creatinine ratio (looking for early kidney failure re: the dilute urine he's been having). Normal, normal, and more normal. We still have a full thyroid panel pending that probably won't be back until next week.
Hopefully he'll hold steady with the phenobarb for awhile.