I am experiencing diarrhea, passing gas and low back pain that moves. the diarrhea is off and on, every other day. i am burping for almost no reason.

Consider this...: Passing lots 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, pelvic pathology outside gut, stress.