I was sick during induction-the worst part was the headaches-and I think it has to do with how many carbs you were taking in before you started. The more carbs/sugar you had in your system, the worse withdrawals you will have. I guess it's the sudden drastic drop in blood sugar, and yes, that alone can make you feel puke-y. Like csoar said, try easing into it-like have a week of only healthy carbs before you try again, no candy, cake, soda, etc. I never thought I'd make it through those first few days myself, but I took tylenol, took it easy, and just pushed through. By day 4 or 5 I felt good again-so even if you are just one of the unlucky ones who gets "the flu", it doesn't last long.