Hi
I am so sorry that you are suffering like this...not fair at all.
Yes, they only use about 50cms to make a pouch and valve and yes, given time it will stretch and actually can help make your life bearable...
When Dr C did all of my redo's he told me that I shouldn't worry, that I had more than enough left for another pouch and if need be he could even put it on the left side for comfort reasons. (like if the intestine could not be stretched to the right side or if my abdominal wall was too torn up to be used on the right side...)
You know me well enough to know that I would go for it and the chance for any improvement in my quality of life...you have to be the judge and you must pick a surgeon that you trust.
It is a hard surgery but you have been through it before so you know and understand the risks.
May God be on your side for this one.
Good luck
Sharon