Mine has always had sugar issues from skipping meals. I too ended up in the emergency vet hospital with mine after shots, she became sick and wouldn't eat, and then she had the same symptoms as yours (dizzy, lethargic, and glassy eyed). I had to find someone (a neighbor) to stop in during the day to feed her. Maybe you can go home to feed her at lunch? She's still a baby, so she will have a lot of energy, there's no stopping that. Just make sure she eats often.
What instructions did the vet give you? I'm curious :P