Emetophobia......... please help?

First of all, it sounds like you're more scared of getting sick or scared of germs themselves than you are of the physical act of vomiting. Second, this is a case where exposure therapy would definitely not be warranted because of a lack of willing subjects to help you out. Education seems to be the implied cure here. Try to learn as much as you can about the process, familiarize yourself with anatomy and triggers, and learn all you can about transmission of germs and bacteria. The more the know, the less you have to fear from the unknown!