No matter what the outcome is for the dog, I would find another vet. Most vets will make arrangements in an emergency.
Things like this make me very thankful that I bought a very cheap health insurance policy for Leo, my Lhasa Apso. It's cheap, and it has paid off for us. It even pays for his teeth cleaning. When Leo had his first seizure, the insurance paid for a lot of tests, brain scans, eeg, etc. He was able to go to a doggie neurologist and be diagnosed with a rare case of adult onset hydrocephalus. It was possibly a result of a reaction to a distemper shot, genetic, or an inapparent injury. We will never know for sure. It is very difficult to watch him have a seizure.
If you ever witness a dog having any kind of seizure, do NOT put your face or hands near their mouth, keep children away and keep other pets away. During a seizure the animal's senses are disrupted. They may not be able to recognize friendly faces, and they are afraid. They might bite in fear or be attacked by another pet because they are acting strangely. If your dog is having a grand mal seizure (those are the big ones where they loose all body control), gently talk to the dog and stroke it (but not near the face). If you have quick access to one of those flexible ice packs, hold it on the dogs back just in front of the tail. During a grand mal seizure the victim uses a lot of energy and his/her temperature rises. The ice lessens the stress on the body. Only put the ice pack on the back right in front of the tail. The skin in other areas may be too sensitive or it may be too shocking. Studies done by vets have indicated that this is the best place. When Leo has had seizures without the ice pack, he woke up blind and confused. He wouldn't even respond to his name. He was blind for 5 minutes, and took at least a half an hour for him to seem to know who or where he was. With the ice, Leo has no blindness and is only confused for a few minutes.
Sorry if this has gone off topic, but if the dog continues to have seizures they may get worse and the info might come in handy to the OP or other owners of dogs with seizures.