i have serious problem of constipation and loose motions after having any kind of food ie. lunch dinner or break fast  i am having this problem since 6 mnts and once i have done as per doctor advice sonography but nothing was wrong doctor said it is fine. but after eating in 30 min or so constipation occurs and lose motions occur and after that i feel very hungry and cant resist to eat so the circle continues.. and i have become very week i cant lift 5 kgs also but i am gaining weight very fast. please suggest me. thank u