Yes, he needs to be seen by a gastro doctor. My husband avoided it for years but when he went the meds they gave him eliminated any discomfort and now he recommends them to everyone.
He may have diverticulosis,I found out when I went to get lmy colonoscopy that I have diverticulitis . I don't have symptoms. take him for a colonoscopy they really are not as bad as they used to be. In the mean time help him figure out something like a sanatary napkin or a diaper. I would I have. When in need.