I had some discharge from my rectum between stages 2 & 3, but certainly not to that extent. Has the amount of output in your bag changed?
It might be a good idea to get acquainted with Dr. Boudreaux's butt paste for the chafing. And careful what you wash off with. I thought baby wipes were a good idea. Turns out plain warm to cool water is much better!
Hang in there!