Hang in there!
I read through the posts again quickly, and did not see natural yogurt (Dannon, Breyer, etc.) mentioned.  In people it helps restore normal flora (bacteria) in the bowel, particularly after a course of antibiotics, but not just in that case, of course.  So does buttermilk.  Might help.
And, I like to use grated cheese for a protein supplement, which I mentioned, but actually, cheese can be constipating.  Maybe other milk/fiber products would be better, like yogurt, powdered milk and oatmeal, etc.  Just a thought.