 [ Symptoms ] fainting nausea dark loose bowel associated with irritable bowel syndrome i have symptom similar to irritable bowel syndrome usually it happen very sudden acute stomach pain urgency to go to bathroom dizzy fainting nausea even vomiting in addition i have dark and loose stools it has been this way for long time i have this kind of episode several times should i see doctor [ Disease ] him you have what my wife had many years ago all the same but as they say she grow out of it i think at one time she was put on fibre gel because of the very loose stools so the could help you to but from what i have heard ibs is just apart of growing up adult style some get it and us others do not good luck