Frustrated...Again

I did well yesterday. I turned down candy, cookies, chips, etc. at my workshop. I came home and squeezed in 45 min on the elliptical before getting my daughter from preschool. I ate well at dinner (black beans with low fat cheese), which was about 6:30. I was tired, sore, and grumpy. I finally got my little girl to sleep and then I am hungry. It is 9:00. I eat 2 hard boiled eggs and 1/2c -1c of chicken salad (fat free mayonnaise, pecans, apples, relish). I then ventured off to some BBQ potato chips. I continue to graze as if I am searching for the one thing I TRULY want. I hate how I do so well and then all of a sudden all of my old urges come back full force. Last night I even started thinking about what it would be like to stop and get donuts or chicken minis this morning. The negative thought find a way to sneak in and then attack full force. I been banded for 2 months and lost 16 pounds, which used to be 21. I have not truly lost weight in weeks. I was feeling this way and then had 4-5 days of feeling way more optimistic. I just ate how it is such a rollercoaster because then when I am down again it seems that much harder to pick myself up. Why is the mind so irrational? I have to stop focusing on the scale and focus on making good choices and exercising. I will drink my shake for breakfast and take my giant water bottles to workshop.