Hi Traveler60
I have yoyo'd with all kinds of diets, trust me it's not through lack of trying that I haven't lost weight.
The decision to go ahead WLS is not a decision you take lightly, you need to put yourself first. I have sisters who didn't understand or support my decision. But I decided to write a letter to them all explaining why I needed to do this and what I was going to get out of it. Maybe that's one way you can let your sister know what you want to do.
I think your really brave to go ahead with it, it's hard and I'm on my fourth day but it's worth it.
Good luck and remember we are all here for you
Satters