First week postop - anyone recognize this pattern?

I actually had my surgery on March 10, but I got readmitted to the hospital until the 17th because I couldn't keep anything down. I'm really struggling to get Fluid and Protein down. I do the best in the morning, shortly after I get up. About midday, I start vomiting, small amounts, and I have to stop trying to swallow anything. I have to wait several hours until anything will stay down again. I am being able to make progress day to day, but the midday vomiting doesn't change, even though I'm taking zofran every four hours.

Does this kind of thing seem familiar to anyone else?