I agree with the rest of the posts. If you feel that you have put forth the effort, then go ahead and get banded. If you don't feel ready for this, then don't do it. You're friend is not being a friend right now. I would hate to see you get banded, lose some weight, and later on put it all back on.
There's no harm in waiting if you aren't ready. I turned down the procedure twice in the past 6 years because I thought I could lose the weight on my own. As time went on and I became more and more frustrated, I realized I needed some help. Just remember, the band is a tool. You are ultimately in control of what you want to do. I have yet to be banded and I'm glad I'm doing it. I have already started working out again and preparing myself for a life after the band.
I feel for you, I really do. Just remember, those of us on this site are here to encourage and support you too.