We're all a little different in this too.
I used to get acid reflow, the whole area between the stomach and the throat would get sensitive like strong heartburn. Usually that was accompanied by the whole chestbone area feeling sore and sensitive.
Id also get poor digestion, food would sit like a lump in my stomach. Other get the runs and abdominal tract cramps and pains.
This seems to last about 3 or 4 days, starting about the 2nd day.