Kids (3.5 and 1.5) both developed diarrhoea at exactly the same time, without any other symptoms. Neither are upset or unwell. But it's been going on for a MONTH! We are going through a lot of bedsheets and washing.
It must be a bug as they both got it together, but what kind of bug goes on this long with only one symptom? Nobody else in the house has it.
When would you go to the GP with this? Obviously sinister causes can be ruled out as there's two of them with it. But is a month a concern that it will never go away without some kind of treatment? Or two months? How long?