Thanks for writing your query to us.
Blood in the stools suggest that either there is internal bleeding
that is giving rise to abdominal pain
. You are feeling weak & tired thats because blood loss in stool. Kindly consult your treating doctor. He will examine throughly & based on that he may suggest scopy that will identity the cause. In the mean while, try to avoid eating fried spicy food.
Wish you good health.