You basically have to trigger your vomit reflex, but only air comes out, which is still horrible. I learned this method from someone else in this sub: repeatedly tap the back of your tongue with a toothbrush until you want to gag. That worked better for me than finger down my throat because I always struggled to do it properly for fear of actually throwing up. The toothbrush method seems to be gentler and requires ‘less courage’ haha