Hi Wendy,
I am sorry to hear that you are feeling discouraged. The band is the tool that will help you lose that excess fat. The thing I have discovered about the band is that it makes me completely aware of everything that I eat. I struggle with eating too much, and eating the things that I should not be eating. The thing that I have found that works the best for me is having a strong support system of friends and family that are completely supportive of the effort I am putting into losing the weight. In a way you are right, at times we are our own worst enemy, but it isnt about making a bad choice and beating yourself up it is about what you do after you make the bad choice. Making bad choices with a diet can be completely discouraging and I am not saying that you shouldnt be feeling how you are feeling but I think it would be better for you if you make small goals for yourself and Celebrate reaching those. This process is a one step at a time process and the wieght will not melt off nearly as quickly as it was gained.
I use the My Fitness Pal calorie tracker and it has helped me enormously. I find that it can be annoying and tedious at times as far as recording everything I have made and eaten but I also found that now the second someone offers me something that I know I shouldnt eat I take out my phone and look up the calories depending on my calorie goal I may or may not take it. More often then not I refuse food offered by friends or coworkers because I know that it will set me back and I did not put my body through this just to let myself down. You can do this, you are strong enough to make this work. Just believe that you made the right choice for yourself and hold your self accountable for everything you choose to eat and everything you choose not to eat.
Good Luck with everything ~ Jules