My cat seems to be having seizures

My 7 year old cat seems to be having seizures or some kind of attacks. He falls down and just cries so loud. He is also drooling a lot during the attacks. They last for just a minute or so and it just started last night. When they are over he seems fine, however he has no appetite and is hiding a lot. My vets office is closed today for the holiday and I don't know what to do.

Go to a vet emergency clinic

He might be having seizures, or he might have been poisoned.

Ditto what Luba said. Get him to an emergency vet, or he could very well die.