I've Had Blood In The Toilet For Over A Year

I've had blood in the toilet for over a year now....I've had colonoscopy and endoscopy a yr ago...I asked dr about blood...he said it's hidden hemmorhoid, don't worry. But a yr later the bowl is still red. Isn't it an open wound in a bad area? Should I worry about cancer or at least infection? I am overweight ...and sit a lot at desk...65 yrs old...what else can I do?