I'm so sorry to hear this!

Does he have a fever? I know fevers cause seizures and seizures cause fever. It's such a vicious cycle. Maybe that can help. Also, I don't know if this applies to dogs as well but what's he's phenobarb level? Is it too high, too low? Both of those things can cause seizures in humans. Maybe he's just immune to the phenobarb all together? How long has he been on it? Maybe it's time for a change or to add something as a suppliment?

Either way, I hope he's done with this horrible cluster. I hate it when my hubby gets them.

Hugs to you and Alex.