@stouffer95, here are a few other discussions that talk about persistant diarrhea after colorectal cancer.
https://connect.mayoclinic.org/group/colorectal-cancer/?search=diarrhea&index=discussions
But having it for 11 years is a long time. I can imagine that this is extremely frustrating and limiting to your daily activities, especially outside the house. Have you discussed ostomy options with your team or is that a non-negotiable for you? What other options have they suggested?