you are not going to die. Gastric bypass has a 0.3% mortality rate, VSG is even less. So that means you have a 99.7% chance or better that you're going to get through it just fine. And you will. Those odds are excellent. My surgeon has been doing these surgeries for 30+ years and has never lost a patient. They'll put you through all sorts of medical clearances (if they haven't already) to make sure you're healthy enough for surgery. YOU WILL BE FINE!
on the continuum of surgeries, VSG and RNY are among the safest surgeries there are. They're much safer than hip replacement surgeries, for example, and you know they do hip replacements every day, so...
for that matter, people have died during tonsillectomies or wisdom tooth extractions. How often does that happen? Almost never. Same with weight loss surgeries. It's not going to happen.
as for horror stories, quit reading them. Now. Major complications are very rare. Almost all of us have had either no complications at all, or very minor ones that are easy fixable (like a stricture). You will be fine. I know it's hard not to be afraid, but these are very safe surgeries with very little chance of major complications.