I have had diarrhea for almost 40 yrs., since my first foot of ileum was removed. But I think a lot can be controlled by diet and meds. I could only tell I was flaring when the D got worse, and felt worse, because I don't get much abd. pain unless I obstruct . Some folks have tried adding fibre supplements or bile salt meds which can help.
Diagnosed at age 19 with CD.
3 small bowel resections, 1 for perforation, 2 for strictures