Serenity is correct about looking for the underlying cause. My granny used to make this little tonic when her tum was bothering her. Take the juice of about 1/2 lemon, put in a little water for washing it down, and then stir in a half teaspoon or so of baking soda. It fizzes for a second like the test tubes in an old mad scientist movie...well, not so much but it is fun. Drink it down soon as you can and you'll feel better soon.