Blood in diarrhoea for nearly 2 weeks?

Fresh bright blood is normally from fissular or hemorrhoids, darker blood is from something that has irritated the bowl and caused it to inflame hence the bleeding, go back to doctors or phone them and see what they can do as with current ecoli outbreaks etc... you can't go wrong going back to doctors it does sound like you had mild infection but I'm no doctor all I do know is that if problem still persists go back to doctors,