Your autoimmune diagnosis is a great reminder that not everything is related to weight. I read a lot of accounts in these pages that doctors tend to attribute nearly everything to weight when a patient is obese. Which can lead a patient to think weight loss surgery will cure everything, which of course it doesn't.
Another great reminder is that you end up being the expert on WLS in your life, both with your family and doctors other than your surgeons. The moral of that story is to do your research. Before anyone goes ahead with surgery, they should learn the risks, as well as learning - and accepting - the lifestyle changes that have to follow surgery in order to have your outcome be successful.