I also had the vomiting 4-5 days after. My docs thought it was from the anesthesia wearing off. I didn't have it after surgery #2 when they changed my anesthesia to a spinal block which allowed them use less of the general anesthesia. The thing I remember most about it was how much it hurt. Holding a pillow against it as I threw up helped a lot, but my abdomen hurt like crazy during and after all the vomiting.