My vet used to compound a concoction of biosol/endosorb which worked wonders for diarrhea. I always had a bottle on hand when I showed as it was an excellent treatment for stress diarrhea when we were traveling.
It's not working as well the last few days, but I think it's stress related. The kids arrived Sunday and are kind of loud. He gets pretty nervous about the noise and activity. I'm not too worried at the moment...we'll see if it gets better again once they leave. Still haven't done the ACTH, haven't had time/car this week. Once my days are my own again, I will get him in and we can finish this once and for all!
A good horseman doesn't have to tell anyone...the horse already knows.