retaining water???

I weighed myself on Wednesday night.  I don't like weighing myself, because then I start to become obsessed with the numbers and would end up weighing myself 400 times a day.  But I wanted a "pre-surgery" idea of how much I weighed, so I could try and keep things in check while I am "sitting on my ass" (a direct quote from my doctor) for about two weeks.

Thursday I had surgery, and spent the rest of the day puking.  I think I managed to keep maybe one bite of toast inside me.

Friday morning I decided to weigh myself, figuring that I'd probably lost weight due to 24+ hours of no food going through.  But the Wii Fit said I'd gained EIGHT pounds.  Whaaaatttt??? 

A few hours of frantic googling later, I think I'm just swollen and retaining water from surgery.  This morning I weighed myself and I'm only up 3 of those 8 pounds.  Maybe this is the universe's way of discouraging me from living on ice cream and diet ginger ale until I can run again.  Yikes.