Thanks so much for your input everyone!
Jackson did a lot better today than he did last time. And they gave him (as said above) something first and pre-medicated him before giving him the Distemper vaccine which seemed to help a lot. They did not include Lepto in that this time. He was due today on their records for Distemper as well as rabies and lymes but I said I didn't want to give them all at once. He seems fine right now, he's very sleepy so he's asleep on my bed. And he's a whopping 8.6 lbs!!