You are not alone with your upset stomach. I am in my third week on Atkins, and during induction I was miserable. I was tired, I ached all over, and worst of all I felt stick to my stomach all day long. Based upon some advice from this board I added some extra potassium and calcium to my daily supplements and within two days I began to feel better. I moved out of induction after the two weeks and into OWL, so that I could eat some additional types of carbs. I am still trying to stay at 20 carbs or less, but I allow myself some berries or other low carb vegtables which I think has helped as well.

Good Luck!