Checking on Cyndi55. I hope your pup is ok. If he didn't go to a doctor last night, please call your vet and let them know what he was doing. They may want to see him today to check him over. I followed up with a vet visit just to be sure it was Low Blood sugar behavior I saw. I'm over protective and for my peace of mind I got her checked by my vet and discussed her behavior with them so the vet could tell me what to do if it happened again. Let us know how he's doing in a new thread if you can. You'll get more suggestions that way because more people will see it.
