Tightening pain in mid stomach. causes nauseous, makes me gassy and i have a bloated belly. what could cause this and how to cure it? 2 days like this

Feeling gassy...: Feeling full of "gas" may reflect malabsorption of food (like gluten, lactose), intake of poorly digested food, or choosing foods known to promote gas (beans, fizzy drinks). Sometimes its more complicated--a stomach emptying too slowly, bacterial overgrowth syndrome, delayed intestinal function, partial obstruction from any cause, infection, rectum problems, and pelvic pathology outside the gut.