Swelling, soreness, and sleepiness is normal. My dog actually laid down on the floor at the vets office he got so sleepy after the Lepto shot. Totally unlike him in a new place. He's usually try to get to everything/everyone. He's an adult. I imagine it is a little worse for puppies. We had agility class about 5 hours after the visit, and it was like he was dragging a load of bricks. The vet had warned me it might be that way after that round of vaccinations, and to just keep an eye on him and not push him at class.
If you're worried, I'm sure your vet wouldn't mind you giving her/him a call to discuss.
If you're worried, I'm sure your vet wouldn't mind you giving her/him a call to discuss.