Usually I get stuck when I'm hungry and end up eating too fast. It's always my fault, I think my band is at the right tightness though.
Usually what happens to me, is I try to tough it out, but I get progressively more nauseous until it comes up on its own. I sometimes encourage it because the feeling really hurts and ruins my meal. I find that after I throw up, I take a minute or two, and some small sips of my drink and I end up resetting and I can attempt my food again, this time slower and more controlled.