I had a similar issue. I was banded October 2007 and did really well the first two years. I learned to eat very healthy, even became a vegetarian, and exercised regularly. I had lost over a hundred pounds and went from a size 28 to 14! And was on the right path to reaching my goal.
I didn't go back to school, instead I entered into (and ended) an unhealthy relationship and lost my routine. I still was a vegetarian but got into a very bad habit of eating slider foods and quick and easy junk foods. I also, turned to food again as an emotional support and quit exercising.
I ended up gaining over 20 pounds and one size!
To help get back on the right path I'm doing a couple of days of liquids then soft foods, per doctor's recommendations. And I started journaling my exercise and daily food intake again like I did when I was first starting this journey. I think the main points to remember in success is holding oneself responsable for what you eat, how much you exercise, and why you are eating. Having a routine/schedule helps me so much more!
Maybe you should look back at what was working for you in the beggining and get back into doing that again. Good luck!