Holy cow I know exactly what you're talking about. In college, particularly my final 2 years, every other day (sometimes every day) I would randomly get the urge to gag. I wasn't nauseated or feeling sick either. I would be walking along and all of a sudden it's like your esophagus tries to get rid of something that isn't there. I got pretty good at disguising it across that 2 year time frame to where I didn't even have to open my mouth anymore.
When I got out of college it totally went away. I wouldn't want to think it was stress induced but that is the only link I can think of. Maybe altitude also (my college was high alt.).
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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