My ex's aby Prattley had the same problem when I first moved in - It took us 3 months to figure out it was stress related. He was on metronidazole to which helped a little. A year later I got Bastet - Prattley got the same diarheoa thing again - we knew it was stress related but at least this time it wasn't so bad....

Maybe its an aby thing to get stressed and then get really sick with one thing or another?