I agree with everyone here. Eat often, plan your snacks, pair complex carbs (aka fruits & veggies) with lean protein and small amounts of healthy fats, and you'll fall into routine before ya know it. The first few days are tough, but give your body a chance to get over the shock of not getting overindulgence anymore.
If you can spend years beating yourself up mentally and remain standing, you can HANDLE a few muscle cramps and cravings. A little pain has NOTHING on feeling insecure. Remember that next time you wanna quit. You can do this!