You are not alone.
I am petrified of vomiting. It is a sensation that I find intolerable so I will go to great lengths to avoid it. Whenever, I see and/or hear someone doing it, I panic and flee. If someone has a stomach virus, I avoid them until they have recovered, because I don't want to contract it.
My fear started in childhood, when I had to take antibiotics for 9 months. It was 9 months of stomach aches and nausea. Yuck.
I think the fear developed into a phobia, because I need to feel in control. Vomiting isn't something I can control so I feel very threatened by it.
I take Cipralex for GAD. Shortly after I started taking it, I discovered it has eased this daily worry.
Whenever, I feel nauseated, I sip, watered down juice and try to do some deep breathing. If it gets bad, I take Gravol or Stemetil.
Is the phobia related to OCD? If it is, treatment for that condition should help improve your quality of life.