I had to do 2 weeks pre-op liquid diet which consisted ONLY of protein shakes, clear broth, sugar free jello and sugar free popsicles. It totally sucked at first, but by day 4 I felt pretty good...and I lost 20 lbs. in those 2 weeks. You can do it!
I used to attend O.A. and I too lost a good amount of weight. I am fortunate that my O.A. groups never frowned on weight loss surgery. Higher Power made doctors too after all. I have been thinking about going back to O.A. just for the support its nice to know that everyone there gets what you are going through. I went back briefly before surgery and met another woman who had the sleeve done. No one judged her, we all go there because we have issues with food. The surgery is maybe the 9th tool.
I promise it gets easier. Just stay focused on your goal. I used to hate eating around people, but now I eat at the table with my family or I sit and talk to them while they eat.