Just get back on track. What more can you do? Go shopping and purchase legal foods only and get some good recipes. Whenever I am craving ice cream or a cookie, I have a low carb version. They are satisfying and they do help with the cravings. If you could stand it, get back into induction for a while...atleast a couple of days. Remember, if this is going to be done for life, you can't let slip offs cause your down fall. Screw-ups are expected so just move on.