Since 4-5 weeks i am facing issue with constipation as well as thin stools. For initial 2 weeks i managed with isabgol, then i left for a week and suffered with return of thin stools and smelly farts. The next week i had loose stool(i ate something spicy outside) then soft stool again.. Also a little discomfort in coccyx area. Now as this diarrhea type thing came up, I consulted a gastro doctor online who gave me rifaximin 2x 5 days and a probiotic, it improved my condition, during the course my thin stools and constipation went away as well as farts. Yesterday my course ws completed, yet again today I am facing similar thing, soft stools with constipation..i went for bowel at evening today, little came out in 4-5cm clumps. Then i fet something is left bt nthing was there. And it felt better with a fart. I am scared if this is anything serious i mean like colon cancer or ibd :(. I dnt hv any bad habits, no junk food, i exercise daily, drink enough water. Should I ask fr sigmoidoscopy?