I can't imagine what might be causing the vomiting. I just wanted to wish Zoe a speedy recovery and that, hopefully, you'll be able to figure out what's causing the vomiting. As for the wailing before vomiting, both my Puddy and Yodie do that. I think it's because they really hate to vomit. They're not in pain but it sure sends chills down my spine and, when I hear it, I think "Uh oh, that's the vomit cry." I sure hope Zoe feels better soon.