I was banded on the 11th, but the only pain or discomfort I've had was my throat from the anesthesia, and the actual incisions, which I think is fairly normal. No nausea or anything of that nature (have you tried ginger tea for nausea?). I did a LOT of walking in the hospital, and I think that might have helped.
On day three I coughed up a bunch of congestion, some with a little blood in it, and after that, my throat started feeling better.
By day six, my incisions weren't hurting so much anymore.
Sorry you're having a hard time, but hang in there, it really does get better!