HI hun, it seizes to amaze me how many people feel like this after a few weeks with a band. I am sure you already know this as you will have been made aware and prepared for it.
It takes time to get restriction with your band. You will not get it straight away (well very unlikely) Having the banded fitted is the first step but it is not until you start getting your fills and find hte sweet spot that you will get restriction.
I have had 3 fills now and have 8.3ml in a 10ml band. It is only after this fill that I am starting to feel restriction. However, I know that i have yet to reach my sweet spot as my portion sizes are still larger than they should be.
The loose weight and keep it off you need 3 things. Exercise, Healthy diet and smaller portions. The only thing the band will give yo is the smaller portions. The rest is up to you. It takes great will power with the band.
DOn't best yourself up, you are dong brilliantly and ar no different to most banders out there. Make sure you get your fills as soon as your provider will allow so that you can get to the sweet spot asap. My provider only makes you wait 2 weeks which I think is right for me.