I have read that if you go on liquids for a little while like maybe a few days-weeks it can reverse a minor slip if any. I do not have any personal experience with this but it is just a positive thought.
I also think that your doctor sounds terrible and I would try to find a new one ASAP. I am a nurse and that is just not okay... at all. He did the surgery, if he hates lap bands then don't do them. It is not your fault at all. Just try to relax and de-stress. If it has definitely slipped, which it may not have, go somewhere else that will actually do their job and take care of you and your health.
Best of luck!