I am not by any means a professional, but the 1st time Luigi had his shots at our vet, he had been acting weird all day too. Real lazy and wanted to sleep all day. Then later in that night, he began throwing up and was acting very disoriented. We called the vet, and we took him back asap. He had had a slight reaction to the shots. So he was givin another shot to counter act that one, and he was back to his old self (feisty and playful) within minutes!!! So he was antibiotics for the next few weeks!! But he was fine there after!!!
I would call the vet and chack with them!!!!
Pixie!!!
Mandy & Luigi