I had some of the same worries. My 11 year-old almost talked me out of it, telling me I was fine the way I was. However, I'm a prayerful person and I prayed and I knew this was the tool that God had placed in my life. I also knew He was going to bring me through it with flying colors...and He did! I'm 8 1/2 wks post-op. I've lost 36 pounds. I read something this morning that really hit home to me and I posted it as my status: Worry is a misuse of imagination.
The first week was tough but it was totally worth it. Yes, I would do it again. Best wishes and God be with you on your journey. I'll be saying a prayer for you!