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Sorry you had been having this for the last 2 years. Looking at your brief summary I think you have coronary artery disease. You may be taking blood thinners which puts at high risk for
rectal bleeding.
Have you seen any gastroenterologist for this. If not I would suggest you to see them soonest.
If you have already seen them and did not find answer to the rectal bleeding the possible causes are angiodysplasias which are missed during the
colonoscopy. some hemorrhoids also can bleed intermittently which can be missed during the colonoscopy.
Check for any other bleeding tendencies.
If it is angiodysplasia stopping the blood thinners can decrease the rate of recurrence but because of the
heart disease you may not be able to stop the blood thinners.
if that is the case you have to check your
Hemoglobin more frequently and take blood if it is significantly low. take regular iron, zinc and
multivitamin to encourage new blood formation.
good luck.