A male in his 40 started belching.It had a very low frequency initially but over a course of 2-3 month his belching became worse. He used to belch for half an hour continuously and after a break of 1-2 hr it would repeat.None of the doctors he visited found any signs in GIT that can cause this high degree of belching. His belching became even worse depriving him of sleep or allowing him to eat. As a last case resort he tries to commit suicide but is interrupted by someone and brought to hospital again. Can you diagnose him???