Blood in my stool

I have been stooling blood for the past few years and it has now made me very lean. I did some tests and all that was found was E coli for which I was given Augmentin which I have used but the blood is still there. Please, what could be the problem?
Jennifer (by SMS)

Blood in the stool could be from an affectation of the bowel or from a bleeding spot in the anus. For example, if the blood is fresh, then it could be from a bleeding Pile (Haemorrhoids). The solution is for you to see a specialist doctor in a Specialist or Teaching hospital nearest to you for a proper medical examination and adequate tests.