it's obviously been 6 years and your'e unlikely to get this reply but I still feel compelled to say my peace.
First, no one is an autism expert. It just doesn't happen. It is such a varied disorder that anyone claiming to be an expert is deluded or dangerous. Second, your child has loose stools because you're giving him treatments that he likely doesn't need 5 days a week. What did you expect? God I hope someone took your kid away from you already. My qualifications you ask? I work with kids and adults with special needs trying to unf*** up what damage their parents did