Hello,
Your body is adjusting and probably freaking out.
Might be dehydrated if you aren't getting in fluids. I had 1 oz cups and I drank one every few minutes and kept a tally. I made sure each day I beat yesterday by at least 1 oz. it really helped push me until I started hitting my goal. Once I was able to drink bigger sips, I graduated to drinking from a cup so I could use ice. I prefer my water ice cold. Still keeping track (I track everything, everyday)
Try some Gatorade with protein, or any of the clear protein drinks. They count as fluids and proteins and the protein promotes healing as well as nutrition.
I was very lucky, I had a super easy recovery and had no desire to eat so I never went thru the "missing food" stage.
I did get a little creative and drained different soups so I could have different flavors. Plain broth was too bland for me. Other people ate the rest of the soup so I wasn't wasting a bunch of food too.
I hope you feel better soon, if not call your surgeon.