I feel for you. really I do!!
I just would like to tell you what I tell myself when I have "that feeling" that your post seems to have.
What else do you have to lose? You are eating healthier, less, exercising more, lost 27lbs. Quiet your inner voice and relax. The band is a proven successful tool to a lifestyle change. You have done great in changing the lifestyle. Now get out of your own way and let the band do it's job, in due time of course.
What you are risking with your expectations and your current mindset? You already know the answer. Past behavior is the best way to predict future behavior. So, like me, you have probably gone on countless diets before and felt the same way as you do now and you GAVE UP! The mindset has to change or the pattern will repeat itself.
You are a success story in progress!
Just know that I am talking to you as if i were talking to myself because I have been there, done that, worn every t-shirt (men's sizes only)
Head up, shoulders back, and for goodness sake, quiet that voice inside!
Bee well!