I had the same thing last week. I found that I was not drinking enough water and my kidneys were struggling. Drink water all day. It helped me after 2 days.
I have not had any issues with the surgery. I don't feel bad or hungry. I had my surgery on February 12, 2008 and today is my first visit back to the Dr for a follow up. In total I've lost 32 lbs this month, 2 weeks pre-op full liquid diet and 2 weeks post op full liquid diet. Since the surgery 2 weeks ago, I've lost 15 lbs. My scars are healing very well. I hope this helps you.:biggrin: