Hey, I understand what you're talking about. I was banded the same day as you, and up until a couple days ago was down 17lbs (including the loss on the pre-op diet). Well I saw my first little gain yesterday (I started mushies on the 25th) and of course I freaked out, since I was used to the downward trend over the past 3 weeks!!!
I KNOW that this first month is for healing, and pre-banding it sounded logical. BUT I can't help but get worried, especially since I'm feeling 100% again, that this will be just a temporary fix, and all the weight will come back.
Just keep reminding youself (as I do) of what you know, how this process will go. I know I have to give myself a mental check a couple times a day. I guess this freak out session is just part of the process....it'll soon pass.