I was nervous about my decision. I even got a bit weepy right before surgery. I worried that somehow the sleeve would not work for me. I worried that someday I may need that other 85% of my stomach! All of that is normal. But here's what happened: My sleeve does work and I've lost almost 80 lbs since then. My blood pressure has dropped from prehypertensive at 120/80 to 107/66. I haven't missed that other 85% a single day so far. I was lucky, I had zero complications. What works is following your doctor's orders both pre and post op. What works is starting to adopt healthy habits like regular exercise. I don't love to exercise but it sure is a lot easier now without all those lbs weighing me down. What works is knowing that you are putting your body through a lot after surgery so stalls might happen, they are normal, and if you stay on track, they will pass.
Good luck with your surgery. It's good to go in with both eyes open as bad stuff can happen but most likely, you will be just fine.