There is one thing in your statement that I really hope you can see as a positive... you lost 18 lbs in 2 months. That is something many of us could not say prior to the sleeve surgery, so please be proud of yourself. That is huge!
Other folks are highlighting the issues I had challenges with when I was originally banded (eating foods that were not always the healthiest choices for my weightloss). If you are continuing to eat healthy, avoid carbs and sugars, and workout regularly, hang in there... change will happen.
Congratulations on your successes so far, and keep your head up!