Hi, may I answer your health queries right now ? Please type your query here...Hello, What specialist deals with prolapsed rectum and constipation. I have had serious problems with it no matter what I do. I could drink 2 gallons of water, use benefiber, eat fiber, prunes, take docusate and still my stool wants to come out large and sideways. Who besides a family doctor is there to help me? Thank you so much. Lori