org/wiki/Roemheld_syndrome
A typical feature of this is worsening upon rising, because the
gas pushes upward more. Often,
symptoms can be relieved by prolonged, repeated burping. If one has Roemheld syndrome, which, according to the article bel;ow, is fairly common, training oneself to breathe abdominally - where you push the diaphragm into the abdomen, i.e. away from the heart - rather then breathing predominantly into the chest, can also bring major relief.
http://www.xn--dpmartinjunghfer-ywb.