If a dog has a wobbly, shivering, can't jump, leans on the wall - anything like that - and it last for 5 hours, I would really be out pounding the pavement for a vet that would take that seriously! A lot of animals can get so excited by going to the vet the adrenaline and excitement masks their true situation as the system boosts them to cope with and react to all of the smells, new people, animals about, the car trip there, etc. I know that makes a vet's job harder to see this frisky dog playing around - one that was limp and shaky all the way there. If he is hypoglycemia, I would think a little local honey or something with the cheese might be a faster way to deliver some glucose w/o a later downward spike? As you know people who are hypoglycemic are encouraged to take protein but some have to get glucose ASAP so they combine some glucose with their protein. Might be the same with dogs but you need to know for sure with a vet's advise. And if he is hypoglycemic at his age and weight, you need to know why he is not processing sugar normally. Plus, you know that any animal that has prolonged episodes of the type you describe needs a real evaluation by a vet who will take you and your dog's symptoms seriously and will get a full lab workup. I pray it is nothing more than a little Yorkie being a master manipulator to get some cheese, etc., and that he doesn't have any serious situation going on. I sure hate to think of any of these babies being sick and not being able to tell us something is wrong except by their behavior and how they look to us. I wish they could talk or changed color or something when they were getting sick - something definitive! Sure would help!
But they don't so we're left just trying to find serious help when they have strange, prolonged, alarming episodes. Hope that baby is feeling better very soon and gets his fair share of cheese, Momme!