thanks for the advice and good thoughts everyone.
bunjee's feeling a lot better this morning. sleeping a lot, drinking a little, and he ate as normal this morning. i called the vet this morning and they said to just monitor his intake and situtation and if he continues to vomit, then to bring him in, otherwise make sure he gets plenty of water. they're also making a note in his file not to give so many vaccines at once in the future.
we had a short play session this afternoon and now he's back to sleep in bed again. it seems like other than catching up on his lack of sleep last night, he's back to his normal self. i'm still keeping a close eye on him for the day. i think he's enjoying the extra attention.