I don't personally have this thought but it's possible that one or two of the other guys on here do. Everyone has irrational thoughts around emetophobia, that's why it sounds silly when you say it out loud because your rational side is telling you it's untrue and won't cause you to vomit, yet the emetophobe is worried it will.

I'd try and keep in mind what happens on those occasions when you do only go a little, or not at all - nothing, right? I bet you've been there many times and I bet not once has it made you vomit