I had a problem similar to yours. It was never a feeling of throwing up after eating, though, just a feeling of throwing up in public. I think it started when I was in the 5th grade and threw up in front of my class. Ever since then, I'm always aware of how my stomach feels. The feelings I have have faded away in the past few years but once in a while, I'll catch myself trying to figure out if I'm sick or not, which I'm usually not. I really do think it's all in my head since I haven't thrown up since that day 13 years ago lol.
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Lori