As I am still battling the psychological aspect of being obese, I have eaten too fast a few times and got the same feeling you are talking about. However, I feel like I need to burp as well. When I keep making myself try to burp, the food comes out. Also, I have to stand up in front of the toilet instead of kneeling/sitting. Otherwise, nothing comes up. (TMI, I know)
I have done this 3 times now and it has always been from eating too fast (and thus eating too much even though I chew everything to a pulp). I always feel so mad at myself and guilty that I am not using my pouch right. I really need to get a therapist so I can keep on top of this mentally.
Maybe just try to slow down and listen to your body - if we do this we will stop eating before we get to the pukeing point. I know this is what I try to keep in my mind while I am eating. I find it hard to concentrate on eating correctly instead of just stuffing food down my throat, but it's getting better.
I hope this helps!