An ongoing problem from the abuse?
You definitely need another doctor, the one you went to is not worth the price of admission as is often the case.
This could be really serious, and to be safe, you must have a proper diagnosis and that cannot happen without all of the appropriate testing. These are some reasons why you might have blood in your stool from http://www.webmd.com/digestive-disorders/blood-in-stool#1
Diverticular disease. Diverticula are small pouches that project from the colon wall. Usually diverticula don't cause problems, but sometimes they can bleed or become infected.
Anal fissure . A small cut or tear in the tissue lining the anus similar to the cracks that occur in chapped lips or a paper cut. Fissures are often caused by passing a large, hard stool and can be painful.
Colitis . Inflammation of the colon. Among the more common causes are infections or inflammatory bowel disease.
Angiodysplasia. A condition in which fragile, abnormal blood vessels lead to bleeding.
Peptic ulcers . An open sore in the lining of the stomach or duodenum, the upper end of the small intestine. Many peptic ulcers are caused by infection with a bacterium called Helicobacter pylori (H. pylori). Long-term use or high doses of anti-inflammatory drugs such as aspirin, ibuprofen, and naproxen can also cause ulcers.
Polyps or cancer . Polyps are benign growths that can grow, bleed, and become cancerous. Colorectal cancer is the fourth most common cancer in the U.S. It often causes bleeding that is not noticeable with the naked eye.
Esophageal problems. Varicose veins of the esophagus or tears in the esophagus can lead to severe blood loss.
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