[header] How to cure a stomach ache [title] Visit the bathroom. [step] Often people who experience nausea or generalized abdominal pain are simply in need of a bowel movement. Before you try anything else, then, try sitting on the toilet for a few minutes while leaning forward with your knees drawn up to your chest. 
This position naturally encourages bowel movement without undue stress. [substeps] Don't try to force a bowel movement by straining or pushing.