Whatever I Eat And Whenever I Eat, After Evry Eating

Whatever I eat and whenever I eat, after evry eating I go for toilet.Its a kind of loose motion.I am really fed up of this.It is persisting from last 3 weeks.There is no blood or pus in the stool.I go for toilet nearly 5-6 times a day.Stool is sometimes watery and sometimes semi-solid.I dont have stomach pain.Doctor said that there is no infection in the stomach.Right now for weakness I am on a tablet called "Viminta Forte".As a result of my problem I am very much fed much fed of this.I am a Software Engineer.My work pressure is not too much.I can easily manage it.Please tell me the reasons to my problem and remedy as well...