Hello. I have gone through your question and understand your concern. Take antacid like Riflux Forte or Pepto Bismol for blotting. Avoid food that increases the symptoms, eat a lot of fresh fruits and vegetables. Drink plenty of water and add fiber to your diet for smooth passage of stool. Discomfort in rectal area can be treated by Sitz bath. It can be done in your own bath tub or a tub big enough to place your bottom. Fill the tub with enough warm water to cover your bottom when you sit, you may add a cap full of Betadine liquid or Epsom salt to it. Do this for few minutes once everyday till the water cools down. Discomfort and feeling of constipation is a common in regular menstrual cycle, so don’t worry. It is due the regular cramps felt towards the lower back and rectum. Another possible cause can be endometriosis that is, growth of uterine lining tissue into colon if symptoms of rectal discomfort get severe during every cycle. Pelvic examination by a gynecologist and few diagnostic tests will confirm diagnosis. Good luck. Hope your concern is answered. Thank You.