My 12 year old daughter has this fear of throwing up. I did not know that so many people had the same trouble.
If someone in her school looks sick she will come home and tell me that she got up and moved far away from that person. When she was younger (3-9 years old) she would scream and cry and wave her arms and shake because she was sure she was going to throw- up.
We were at a restaurant the other day and my son was choking -too much food in his mouth - that's a whole different story! Anyway, she tried to run away from the table. She thought he was throwing-up, poor thing!
She is seeing someone for help, she has other worries, but maybe I should address this issue.
Good luck to everyone. If I learn anything I will let you know.