Hoping you have great success on your journey. I liken WLS patients to any other addiction groups like AA/EA or drug addiction. Until you've experienced the control food has over your life, you can't relate to it. So just do what you need to do to get better.
I have never felt the need to tell anyone that didn't need to know about the surgery. But if I'm ever in a position that I have to disclose, I'm just going to tell them that I had my gall bladder removed or had a hernia repaired.
And if they ask about the dramatic weight loss, I'm going to tell them that Oprah inspired me! :-O
Sorry I wasn't able to write this out any clearer, but the right words just wouldn't come.