Welcome! I'm not post-op yet but I've already found a ton of good resources. First of all, your nutritionist could be your best friend. Did you see one pre-op? If not, find one! If you're feeling like you may fail, get back in touch with your surgeon. THEY don't want to see you fail either!
Protein is key and now is the time to focus on giving your body what it needs over what your mind is telling you that you want. Did you go through a program to get the band? Most programs out there are pretty structured to prevent people from failing. Dig down deep, find that motivation, and check this website often! The people here are so helpful and so inspirational!