Welcome to HealingWell!
I have never heard of anyone bagging it due to constipation. But, then again, most of the members that come through here have your opposite problem.
I see you've been to the Ostomies board... I think that's your best bet.
I know you said you've tried everything - but have you tried a laxative and been consistent with it? For example, as mentioned in a different "breakfast" post, Miralax
is a safe laxative to take regularly. It is an osmodic laxative that isn't habit forming, and has a great history for success. Even better, it's now available OTC.
I really hope you get some relief soon...