Hi, I'm three years out and this used to be a VERY common problem of mine, it happened to me mostly when I hadn't eaten in a while or when I started to get hungry and didn't eat right away. After a lot of discussion, the doctors came up with the theory that the irritation of your diaphragm, by the banding, leads to these problems, kind of pushing gas up to your left shoulder/left side of neck area. That's also why it's worse when you sit for periods of time because it pushes everything up, again irritating the diaphragm. What seems to work is either eating or drinking something or walking around a little. Hope this helps! Eventually you can kind of tell when it's coming on and what to do so it'll become less of a problem.