I believe there is a lot of testing going on behind the scenes. Every Dr is different, but all require a different battery of medical tests to make sure you will survive the operation in an of itself. So when Dr. Now says that he will schedule surgery for "tomorrow," he is probably just doing it for the camera since a lot of prep and testing goes into the pre-op process (and the test results are only good for like 2 weeks or so).
And about the emotional aspect of eating - I had the sleeve operation (VSG) in Sept and I will tell you for sure, the only thing the surgery does is limit the amount you can eat at one time. It does nothing to take away the compulsive eating behaviour...however, a binge for me was eating a lot of food at one time, and the VSG basically killed that ability (a couple weeks ago I got lazy and tried to eat two of the chicken nuggets that I cooked for the kids' lunch, and afterward, I felt like I did one of those eating challenges from Man vs Food, I was so sick and uncomfortable). Because of my experience, I still struggle to understand how Penny managed to not lose any weight...especially in the first month where you eat nothing at all for three days, then slowly move to liquids, then mushy foods. To my original point though, I guess she could have been drinking a chocolate milkshake every two hours, for example, and fought through the pain (Why God why???). When I was still in the hospital, one of the nurses told me that they had a bariatric patient on the day after his surgery had a tray of food delivered from the cafeteria (he lied and said it was for a visitor)-only he ate the tray of food and threw it all up. That is one mad food addiction. Five months out and eating is still a tedious process for me.