If you see someone vomiting, does it make you vomit too?

I know this is a strange question but my biggest fear in school was that someone would vomit. Which did happen a few times. Then I was at a concert, and the dude sitting behind me threw up and it got in my long hair. I would keep reliving these events until it made me actually get sick myself. What reaction do you have if you see someone vomiting in front of you?
If you see someone vomiting, does it make you vomit too?
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