After every meal, I (71-M) get Fullness /Tightness of abdomen together with constant Nausea, noisy Belches etc.( Usually No heart- burn, no sour belches, no flatulence). After getting up in the morning till the taking of breakfast, I have no such problem. After about 45 to 60 minutes of the breakfast, the problem of Fullness, Nausea, Belches starts & lasts for the whole day. My appetite for lunch, dinner etc. is poor & reduced. (My appetite up to breakfast is good). I am strictly vegetarian. I take very light & simple meals. The above problems are going on for the last 2-3 years. Kindly advise the remedies for me.