Bleeding from your S-pouch might be from cuffitis. I am assuming there is a cuff, which is several cm of rectum retained to the spinchter to attach the pouch to. If you don't have a cuff then I understand why your spinchter is having such a problem.
I think you should see a GI to do a pouch scope in order to see what is going on inside your pouch. There might be a problem in it which is causing the blood and contributing to your lack of spinchter control. It might be a course of antibiotics could help.
Welcome to the group!