Any way to prevent vomiting due to stomach flu?

I know that I've likely contracted it last night because I touched the toilet seat in a public restroom and then immediately touched my headphones which were on the coat rack in the stall. Although I washed my hands immediately after using the restroom, I neglected to wash my headphones, and I've touched my mouth and nose and eaten after touching the headphones since. I know that it's probably too late to stop the virus, but is there any way that I can prevent myself from vomiting? I'm HIGHLY emetophobic (having the irrational fear of vomiting) and would honestly rather die than puke. I am not eating anything today just in case, though I don't know if that will prevent it because there is still bile and other gastric juices in the digestive tract when one doesn't eat and also one could have dry heaves. Is there any way I could possibly prevent it?