Hello! Iadvise you to visit one of the Gastroenterologist as many are not cleared from what are you mentioning here like:
1.If the bleed is painless or not
2. If stool is mixed with blood or blood is separate
3. What is consistency of the stool
4.What was the colonoscopy
5. Most imp why you have undergone colonoscopy in May 2012
I hope all these are required before I advise you.Remain in touch. Get well soon.