I had Nissen 8 years ago. Belching is not a problem, but I cannot vomit, had one episode with wretching and that was very painful. It just stopped after a while. I still have difficulty with carbonated drinks and avoid them, makes me feel like choking. Staying on full liquid diet for at least 2-3 weeks after surgery is a must, with meat you better wait a month before you start slowly. According to my gastroenterologist the surgery was a success, but I definitely don't feel the same as before. I would only recommend it, if you really need it and you are out of other options.