Could my dog be having seizures?

Back in November, I got 2 free pomeranians from a guy who was moving out of state. He gave me their backgrounds, I spent a little bit of time with them, and fell in love (They are 4 and 5). Well, yesterday, he ran into my living room, whining, then started acting.. .weird. He flopped onto his side, his head was bobbing like a bobble head, if he stood up, he would sway around, his eyes seemed glossy and unseeing. It lasted 2-4 minutes, then for 30 minutes after, he just layed there panting while I was petting him. This is the 3rd time since November this has happened. I looked online, and it looks like he might be having seizures... and I know we have to take him to a vet, and we will, just not for about 3 weeks (We are going out of state in the morning, and don't have the time right now. They dogs are going with us). Will 3 weeks hurt him, being he is really only averaging 1 a month? Also, how could anyone own a dog for 4 years with this happening and not take him to a vet? It's obvious for other reasons that these dogs have never seen a vet, and we were lied to about that. I don't really know what to do for now, though, other than comfort him as much as possible. Anyone have experience with this?