Hummm, I'm facing the same problem because I actually v* in a fear situation. And as I can see from the replies there are two opinions. One say go ahead and vomit and the other says NO. I could v* even in a normal conversation. So, I'm avoiding to see or talk with others even via a mobile phone. I want to know for sure if I courage myself to v* will help or not. Because I don't want to go through such a painful feeling then I get nothing.
But the good thing here is that I'm not alone
if you decide to go ahead and expose yourself to v*, I'll go with you and do it. Then we till the others about the results.

Good luck for everyone.