I believe that the nausea is a reaction to stomach irritation. When you have a stomach virus it can irritate he stomach lining, which leads to the nausea you feel. In the same way, you've just had major surgery (you saw the video!) and your stomach is not happy with you right now.
Sorry you're having to deal with that unpleasant symptom, but I'm confident that as you heal it will subside. Until then, be sure to baby your stomach. Avoid spicy, acidic, and high-fiber, irritating foods. When your stomach goes through the digestion process it uses a muscle motion to mash the food. You won't want anything in there that can further irritate the stomach lining.
Hang in there...this too, will pass.
Very vest wishes,