You could be suffering form gastritis which causes eructations, sour regurgitations, nausea, vomiting, heaviness of stomach after eating little etc. It could be partly due to amoebiasis, indigestion which could cause constipation, flatulence etc.
Homeopathic medicine has good remedies like nux vom, natrum phos, carbo veg, merc sol, raphanus etc. To relieve you of the pain in the stomach due to above ailments.
Dr.Venugopal gouri.