17 yr male & i've had a consistent condition. after every meal i have bad gas/stomach pain & i have bm shortly after (loose stool). what is wrong w me?

Intestinal spasm?: Not enough detail to know for sure, but it is possible that you are having intestinal spasms after eating. Before rushing off to see your doctor, sometimes increasing the amount of fiber in your diet and taking a fiber supplement, such as Metamucil once a day, may be useful. If you do this, be sure to increase your fluid intake also. If this does not work, see your doctor. Good luck.