Diarrhea may be caused by a whole range of conditions which generally fall into the three categories of food-related, nerve-related, and viral-related.
In all cases, drink large quantities of water.

Use the following formulas for the different conditions.
Each formula is to be diluted in 1 teaspoon of vegetable oil.
Massage over the whole abdomen area.

FOOD-RELATED – Chamomile 2 drops + Peppermint 3 drops + Eucalyptus 1 drop
NERVES-RELATED – Chamomile 1 drop + Eucalyptus 2 drops + Lavender 3 drops
VIRAL-RELATED – Thyme 3 drops + Lavender 2 drops + Tea tree – 1 drop

Make a drink by adding 1 drop of the relevant essential oil to a teaspoon of honey and diluting it in a glass of warm water. Sip slowly.

Food-related : Peppermint
Nerve-related : Peppermint
Viral-related : Eucalyptus