Thank you very much for contacting healthcare magic.
After eating Mexican food you have severe diarrea that may be because of food
poisoning.
Rehydrete your body by taking more water.
Take
ors power for rehydration of your body.
Drink filter water more.
Avoid junk foods and fatty foods.
Avoid gastric irritants like spicy foods, oily foods,fatty foods etc....
Eat fresh fruits or juice.
Take proper rest at home.
Start antibiotics drugs under doctor's suggestion.
Consent a physician for further treatment.
After taking this much care still symptoms are present than stool examination test, cbc,usg is helpful.
I hope my guidance is helpful to you.
Thank you very much.