Hi Candi! Did you go out before or after for a bite to eat? Could it have been a reaction to something like that? Also, if a stomach virus is going around, it would be very possible not to have come into contact with each other, but with other people carrying the bug. Check with the others to see if anyone at work/school/socially might have had similar symptoms.
I don't know about heartburn, but I have on a very rare occasion or two experienced nausea in some locations. Usually it happens (for me) where very tragic things have occured and stops immediately after I leave the premises. It may be that you and your friends did indeed pick up on something that caused you to react physically -- it does happen to some people who are sensitive. Or, it might just be a bad burrito! =P
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