Hello-
First, realize that establishing new habits is not easy, unless of course you follow the Induction and the rest of the program strictly. Everyone has their moments and I call it a carb hangover. no-lol.
Here is a plan: Drink water. Go for a walk and make a deal to stop kicking yourself by the time you get home. Chalk it up and get to work: Skim over your copy of the Atkins book looking for key guidelines. Read some success posts on ADBB. Envision yourself at your goal weight. Get back on your plan re: meals and exercise. If you are not exercising, join some of the challenges. Avoid cheat situations in the future - losing 100 lbs and being the new/old you is worth more. Monitor the ADBB for information, inspiration and to help others. Now get to it!
Glenn