This phobia is a totally different animal. If you are afraid of heights, that's an easy phobia to treat with progressive exposure. You can choose a skyscraper. Take the elevator up one floor each time until you can make it to the top and look out of the window.
With V'g, it's a huge jump. Like going from the 50th floor to the hundred. You can watch videos of people doing and see sites like rate my v and all that stuff. But the only way you're going to know if you're over it is when YOU do it. But at a certain point with emetophobia exposure therapy, you just have to make the huge leap. How do you go from watching videos to experiencing it yourself? It's not like you can say, "okay, I'm going to let the v come up my esophagus one inch more each time until it finally comes up." It's kind of an all or nothing thing. Watching the videos might dull your anxiety with seeing OTHERS do it, but that's like watching someone else hold a spider to get over your arachnophobia as opposed to holding it yourself.