Yes, 'CrazyDogandCatLady", I had the same feeling. Being a diabetic, I think it was more pronounced given I had to watch sugar levels. I had my surgery August 20. I experienced these feelings during pre-and-post Op period.
During this post-Op period, I'm currently in the full liquid phase. I'm looking to see if re-introducing soups makes a difference.
If anyone is a diabetic, be sure to monitor your sugar levels during these phases.