What Causes Bleeding While Passing Stool?

Last year in march some bleeding starts during my stool.I showed to Gen.Physician.He has given me some medicine.It stopped bleeding.Again it happened in may and again I visited the same doctor and taken the same medicine but no relief.It happens on and off.This year in first week of April continuous bleeding starts one-two times a daily.Again I showed to the same doctor.He adviced me for clonscopy test.I have gone for clonoscopy test under gastroentrology department in Maharaja Agresen Hospital,Punjabi Bagh on 30-04-2011 where small Haemorrihods found positve.Doctor said it is small hence no operation required and suggested Dafflon 500 mg for 14 days.I have taken the same tablet.It stopped but again started bleeding.Now I am fed up.I have to commute by metro train and bus dailly for six hour.It is internal pile.Please suggest me what to do.Is laser therapy available in Noida and it is safe or not.Kindly reply at the earliest.