
What Causes Severe Vomiting With Bright Yellow Stool?

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Detailed Answer:
Hello XXXXXXX
Bright yellow stools in themselves aren't diagnostic for a specific cause of diarrhea. The more rapid time that food moves through your digestive tract can account for the bright yellow color because the pigments in the bile that normally color the stool brown don't have time to be broken down in the intestines to do so.
If you picked up an infection overseas, the cause depends largely on where you were, and what things you were exposed to there. For example, were you in Mexico and drank tap water there? Were you in XXXXXXX and ate food from a street vendor?
How long has the diarrhea been going on? What other symptoms are you having such as fever, abdominal pain?
Are you able to stay adequately hydrated? A lot of fluid and potassium are lost with diarrhea. Are you feeling excessively thirsty or making less urine than usual?


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Detailed Answer:
If you are making less urine, then you are likely getting dehydrated. I recommend going in to a clinic where they can assess you for dehydration and electrolyte imbalances, get a complete blood count (which can indicate an infection), and order stool studies for Giardia and ova and parasites and culture.
It is possible, if you were on antibiotics, that the diarrhea is either from a secondary bacterial infection with c. difficile, or could be from intestinal microbial imbalance from the good bacteria being decreased by the antibiotics. You can be tested for c.dificile with the above labs.
Things you can do at home are to drink coconut water (not coconut milk) which has a good balance of electrolytes and will help with rehydration. For food, small amounts of thoroughly cooked rice (cook with extra water, for longer time than called for), apple sauce, bananas.
Pepto Bismol is an antidiarrheal that also has some benefit for traveler's diarrhea, so consider taking that too. Note that it will make stools look black or gray.

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