This may not help but I'm a severe emetophobe... and have been for as long as I can remember.

When I had an appendectomy, the anesthesia did cause me to vomit... but it was not at all like having a sv. It wasn't painful and there was no nagging nausea. It happened and it was over. I was absolutely fine and didn't panic because it happened so quickly.

AND this DOES NOT happen to everyone. I probably vomited from it because I hadn't eaten for over a week because I had appendicitis.