My suggestion would be, rather than overthinking all the possibilities - just tell yourself that it IS anxiety and do your best to calm yourself down. For us emets, it's anxiety 99% of the time, so it's counterproductive to needlessly worry about the things that aren't going to happen. I know, I know, that's what we do, but I can tell you from experience that after almost 53 years of not v*ing (and that's not a typo), eventually you will be able to convince yourself that you're fine. Really.