Lori, I know what you are going through....I went through this with Gracie and Gabriel....healthy but not gaining, diarrhea, bloody stool, tired, etc....I tried the Albon and plain yogurt but I had the best luck with changing them over to baby food (chicken or beef) and using a product called Pecticillin. It is a combination of Kaolin, which increases the bulk of the stool and slows the passage and pectin which provides a protective coating to the intestinal tract. If the Albon fails and you would like to try the pecticillin send me a PM and I will get some out to you.
In the meantime I sure hope little Moxie Moo and Decker feel better really soon...I too would hate to have a sore back end like MM has.