Intestinal Gas, Bowel Movements, Cramps, Diarrhea. History Of Pelvic Reconstruction. What Is This?

I had an unusual problem. I had a lot of intestinal gas, bowel movement, cramps, and diarrhea. When I looked , I something very thin dangle from my rectum, which was very thin. I also noticed when it was in the water, some of the feces had left, and the color was a white color. The width of this was pencil point thin. I have had in the past year and 1/2 the pelvic reconstruction. I have been told that I must take milk of magnesia daily. I have a very long colon, and need to keep from getting a blockage. I do not know what this was. I have had spinach, and thought at first this was an elongated piece swallowed whole (canned spinach). Can you give me some insight as to what this might be?