Are you watching what you eat? Maybe your system isn't ready to eat certain things you are trying. Definately watch your fluids...keep a diary of what you are eating/drinking for a few days, that might show what could be causing the nausea and if you are drinking enough (sometimes we THINK we drink enough, when we really are not). Also, if your output is very watery, you are should drink even more.
My surgery was open, so I don't really know how long it takes for swelling to go down with lapro, but if your doc says its normal, go with that for a little while longer. You can always ask him again at 6 weeks out.