I don't want to frighten you, but I had severe nausea and violent wretching from the moment I woke up from surgery. I had a scopalamine patch, compazine IV, zofran IV, tigan injections, and I was inhaling alcohol prep pads that were held up to my nose - believe it or not, they actually helped some. I was taking all of my nausea medications as soon as they were available and the nurses did an outstanding job of watching over me and reminding me as soon as I could take my next med. I couldn't eat or drink at all my first night. Compazine and tigan helped me the most. The good news is that as the days passed it gradually got better. When I was discharged, I had some lingering nausea when I woke up in the morning that I took zofran for. I'm a little over 2 weeks out now and don't need nausea meds at all.
My experience is really an outlier here. Most of the stories I've read here have been very mild, but everyone reacts to surgery and anesthesia differently.