I haven't talked to the vet because this just started overnight and they are not there until Tuesday with this being a holiday weekend.
We did talk about him being excluded from getting the shot. We have a lot of rabies around where I live. His doctor said we'd try it this time and if he had another reaction, he'd exclude him.
Right now he's trying to rest. He'll sleep for a few minutes, then he's up licking his lips and letting out little snorting noises. It seems like he's swallowing a lot.