I know exactly what everyone means! I'm emetophobic and I pretty much obsess over being or getting sick everyday.
I've found some REALLY comforting stuff on the internet about the norovirus sickness bug, that will probably help a lot of people with this fear...
"The vomiting is a secondary response. It's your body's way, evolutionarily, to respond to an infection. It doesn't actually do anything to help you. (This is probably why, if you can stop the vomit response with anti-emetic drugs or even from anxiety...then it doesn't make the course of the virus any worse. ) There is no need to get the virus out of there, as its not in your stomach anyway s in your intestinal tract. The brain may allow you to "not vomit" if you convince it to. While this is a fine idea when infected with norovirus, its not if you've ingested a chemical poison."
It is ABSOLUTELY IMPOSSIBLE to get infected in any of the following ways:
1. Being near someone who has it, including co-workers or friends
2. Being on a plane with people who have it
3. Breathing the same air as someone who has it
4. Being in the same building as someone who has it
5. Walking past a pool of vomit on the floor, road or sidewalk
6. Through having sexual relations with an infected person
7. Through a cut in your skin
8. Through your rectum or genitalia (as in, on a toilet)
9. Kissing someone who is not yet showing symptoms (note: it may be possible to catch it from someone who has recently vomited by kissing them, as viral particles may be in their mouth from vomitus. But the virus is NOT transmitted through saliva)
10. Number 6, above, applies similarly to sharing cups or utensils with someone as well.
I hope this is helpful I know how hard emetophobia can be.