My kitten just came from the vet earlier this afternoon. She had blood work done and some booster shots. She was not happy with the doctors. When she came home she had about 10-ish minutes to rest. We are babysitting 3 girls ranging from 5 to 14. She started to hiss. I took her into my room and plan to keep her here. But what is really worrying me is that she started to tremble really badly. Almost like she had full body hiccups. She finally has settled down to sleep. I chalked it all up to stress and her being scared. But I am just making sure everything is alright with her. She was born March 11. So is this just stress or something more?