Fell off the Wagon

In addition to the excellent suggestions above I would recommend two things.  First - chart what you are eating and go see a NUT.  The Success Habits of Weight-Loss Surgery Patients by Colleen Cook is the book I have used with its separate workbook, it is a good resource.

Two - get in touch with why you eat.  I have found, for example, that I eat more at work when I am stress out.  There is another book - The Emotional First Aid Kit: A Practical Guide to Life After Bariatric Surgery by Cynthia Alexander is a good resource. 

Hope it helps.
Scott