I know I have problems with acidic foods (including coffee). I have many
stomach gurglings and diarrhea after eating/ drinking coffee (w/o lots of
creamer), wine, champagne, or eating mexican foods, tomatoes without some
kind of milk product to neutralize the acidity. I am not allergic to milk
(as far as I can tell) my son is. I tried some antacids one time before
eating tacos and it didn't help, had the usual problem (in case I had to
get milk out of my diet); So it's some problem past the stomach. I don't
have problems with orange Juice or soda pop, but I'm sure it's very
possible to have the same problems with those.

I've never tried Lactaid- 100, maybe your system doesn't like something
else in that.