Hi Imagine923,
I have just had the same diagnosis just recently..
I persisted for with absolutely no weight loss for over 1 year but I had been not able to keep any food down for about 3 months, I had Fluid removed a few times to no avail, the doctor I had kept telling me to keep following his diet instructions of no Breakfast, tuna or chicken only for lunch and the same for dinner with a cup of vegetables.. Yet I could not even keep down Soups or other soft foods.
I got to the stage where I could no longer put up with the constant vomiting and went to see another doctor for a second opinion. I made the decision to get the band out and have it checked, which he did on the 15th of June 2012, The doctor informed me after the removal of the band that my band was pushing into my liver and my stomach had flipped up from the bottom to the top, (like a taco, as you describe) hence the food had no where to go accept back up and out. My GI tract is scared from the constant vomiting.
He has told me to have 6 weeks for recovery after which he is going to sleeve me, he did give me the option to re-band but after what I had already experience I made the decision to go for the sleeve instead. I have another appointment on the 27th June for a review. I will update after the appointment with any other information.
Good luck with your next surgery.