I had my lap band in Oct 2010 and didn't start losing weight until Jul 2011. Don't get discouraged. Once you start losing, it will just fall off. My doctor told me not to eat anything larger than a small post-it note size amount and always eat Protein first. By the time I finish the protein I barely have room for anything else.
I also know someone that didn't start losing until they had the band for one year. Then it just started disappearing. Like overnight. Now she looks great. Just hang in their and eat lots of protein. It will happen.