Wow, what incredible replys to return to after all this time! Thank you all so much for sharing your feelings, it was really affirming to see that there were other intelligent women with my concerns. I ended up going with the gastric bypass about a year ago and I've been amazed at the surreal changes, as well as comforted by what remains unchanged.
I'm half the weight I used to be, and the difference is amazing. I've found that these changes do not remove me from the body positive movement, but allows me to present my perspective (when the subject comes up) on body issues to people who would never have brought up the subject if I had still been my size.
For me, my weight threatened my quality (and quanity) of life; for others thier quality of life is threatened by how others perceive thier weight. That is why I had the surgery, and that is why I still hold my body positivity princibles, uncomprimised by my weightloss. I'm totally at peace with that now.
In the wake of all the Non-scale victories I've enjoyed, like crossing my knees when I sit, beating a friend at running up a flight of stairs, wearing boots that go around my calves, I realised that my weight loss was reaping me personal rewards far more than soicetal ones. With my degree of weightloss, I was a petite 5'3", 300 pounds, now 150, there is excess skin apparent in my arms and thighs, but I don't give it a second thought. Because this surgery was never about conforming to an ideal, but doing what was right for me. In that, I have succeeded, and it is satisfying!