The circling, as long as he is only doing it AFTER a seizure, is normal post-ictal behavior in some dogs. It should stop within 2 to 3 hours. If it doesn't, or if he circles even if he hasn't had a seizure, then there may be something else neurological going on like an aneurism or a brain lesion of some type.
Has he had a complete blood panel done yet? Performing a MRI on him would be the most certain way to determine what the problem is.
Please post back and let us know how he is doing.
Ghilly.
Forgot to add, until you can get him to help and meds, make sure he's in a secure area where he can't stumble into something and hurt himself. Without meds, there really isn't anything else you can do. When it stops, he's going to be completely wiped out for several hours, meds or no meds.
He's seizing again. Do you have an emergency vet you can contact? If you call your regular vet, there should be an outgoing recording instructing you what to do in an emergency, and this qualifies. Please let us know what happens!