what you are going through is normal for many in the early post op period. it is the hormone dump from rapid fat loss and the adjustment to the healing (I remember thinking "OMG am i going to be burping my way through every meal forever?" Now I read posts like yours and go "oh yeah, i forgot about that part". you will feel totally normal in 3-6 months (for me it was 2 months, but i'm a quick healer)...I'm 15 months now, in and if it weren't for:
being amazed every time i look at a picture of myself
wondering why i don't get winded anymore, ever
wondering how far i need to push myself on the treadmill to get my heart rate into the cardio zone
wondering how the hell these size 2 pants fit me, because that makes no sense at all
...i would not remember I had surgery.