I have had watery diarrhoea for 4 days extreme fatigue extreme thirst can't hardly drink but thirsty can't really eat?

WHO ORS: What can land you in the hospital is dehydration. You can try loperamide (pref w/simethicone). Make your own rehydration solution by buying ors salts or mixing 5c water, 1tsp salt, 6 tsp sugar, & 1 cup oj or a mashed banana (for potassium). You don't have to gulp it but drink a tsp or more every minute . Sports drinks are fine but avoid artificial sweeteners & colors.