hi i had gone through your query and understand your concerns. i would come up with four most possibilities to fit your case.these include
1.first possibility is, HEMORRHOIDS; rectal examination
is usually not fruitful,as uncomplicated piles cannot be felt with finger unless they are thrombosed or fibrosed.confirm with PROCTOSCOPY.
2.second possibility is,DIVERTICULAR DISEASE;rectal hemorrhage and flatulent distension of the lower abdomen may be the presenting symptoms.
x-ray with barium enema
may confirm the diagnosis.
i advise you taking Homeopathic
medicines gives safe and permanent cure for your complaints
consult your local homeopathic physician for correct diagnosis of the case and remedy to fit your complaints. or mail me at firstname.lastname@example.org
I hope this is helpful for you, thank you