Yeah, see thats the kind of thing that gets many emets in strife. Its exactly the fear we have - losing control. Or at least it is for me.
Some days I wish I could just do it in order to cleanse my ATTITUDE about needing control! I see other people vomit, then move on with their lives. I have not vomited while being emet, so I don't know how I am going to react when it does happen. Taking control of something that is a normal bodily function seems rather, well, not good in my opinion. Especially if it NEEDS to happen.