I was/am the same way! I had no pain or nausea in the hospital. When I was finally allowed to drink Water I could drink as much as I wanted (though I tried not to). I've been on purees this week, which includes soft foods like canned tuna or eggs. Anything liquid (like a Protein shake) goes down with no problem, but I do admit that I am getting full with the foods. I started real foods a little early (yesterday) with some chicken breast and spinach, and while I didn't feel any restriction, I kept the portions right (3 oz. of chicken, 1 oz. of veggies). And that satisfied me completely. So far I've no problems with nausea, food aversions, painful restrictions, getting my liquids in, or constipation. If I didn't have the scars on my stomach I would seriously question whether or not I had the surgery at all!
In fact, when I was day 3 post-op I had a total meltdown in the hospital when talking to one of the doctors. I felt that my surgeon hadn't cut enough of my stomach away! Seriously - everyone on my floor had some problem(s) and I had none. I felt great, I was moving around a lot...it just didn't seem right. So she showed me a picture of my excised stomach (it's pretty long) and told me not to worry about it, that I should be happy that I am one of the few that feels great after surgery.
So I'm trying to remember that regardless of how I feel, I should follow the plan and the portions to help me stay on target.