I have a sore stomach on and off for over 6 weeks now with lots of diarehoe. what could be the problom?

Colitis: Continual diarrhea suggests an irritability, inflammation or infection of the colon. The abdominal discomfort in these conditions occurs in the lower abdomen. I recommend a checkup including cultures of your stools. In the meantime follow a diet low in harsh roughage and try some koapectate or peptobismol( which can make your stools black).