Diarrhea: Mix one hand full of Brown Sugar in a jug of warm water - I usually put in 3 or 4 tablespoons of Brown Sugar and then put in the fridge to cool.
Stop eating solid foods, just drink the cooled Brown Sugar concoction instead, which is really very pleasant and removes all hunger pangs.
The Brown Sugar becomes Glucose which feeds your body, the water keeps you watered and because the Glucose is not food, the Diarrhea clears itself up naturally over a few days, when you have shitted everything out and your tummy starts to heal itself naturally.
When you go back on solid food, eat dried toast to begin with and slowly start eating solid foods again - but go back to the Brown Sugar cure, if Diarrhea starts up again, until when you move to solids, it has gone for good.
I am a Diabetic, but I do this for a few days to rectify my body, then back on my usual horrid diet to keep my Diabetes Type 2 down, as much as possible and for as long as possible, on tablets alone - over 20 years so far.
Another cure is a tea made with opium poppy bulb. Put some in water that is 160 f and let it set for a 1/2 hour or so Maybe stir it some..A 1/2 ounce, maybe a thimble full is the dose. Stops those peristaltic contractions cold. Then you can rest.