I’m finding when I’m really anxious - and my anxiety has been bad lately - the smallest things make me want to vomit. I don’t feel overly nauseous. I just get all the very annoying muscular contractions. Just thinking about something gross causes it. I have to make a concerted effort to not think about gross stuff. Even things that aren’t gross trigger it. For instance, I can’t let go of my toothbrush when I’m brushing my teeth without gagging. 
It’s ver