Hi ! I would like to know your dietary and bowel habits. If you eat frequently from outside, and that too some junk food kind of thing, then that may be the reason for your stomach problem. Many kinds of parasitic and bacterial infection may arise for those who eat frequently from outside. Apart from this, some people react to a particular component , e.g., glutten which is found more frequently in junk foods from outside. This glutten enteropathy may cause all the symptoms of yours. Such eating habits can also be a reason for your being overweight if any other hormonal causes are excluded. Try to add more roughage and liquids in your diet. Get investigated for parasitic, bacterial infections and also for glutten sensitivity. Till that you can take a proton pump inhibitor drug along with an anti spasmodic drug. Wishing you an early recovery.