I have no advise on hibernation syndrome. I suggest checking out
www.obesityhelp.com for help.
We all have platuas along the way. My NUT has always encouraged me to log my food whenever the scale freezes to make sure I am still on track. Exercise is very important (as it seems you know), so keep it up. Your body has to get use to the weightloss & all your changes.
I had lapband on 12/11 so feel free to pm me if you have any other questions & sorry I couldnt help you with this.