Hi.
Thanks for your query.
Noted the history and understood your concerns.
Diarrhea that persisted for 5 days and giving you white tongue, rash at the back of arms, pain in abdomen can be due to the following reasons:
Traveler's diarrhea that is an intestinal infection looks to be the reason.
Te red rash appears indicating bacterimia or
septicemia.
White tongue too indicate an intestinal infection.
With intestinal infection the urge to eat vanishes as a normal response.
I would advise you the following in such a situation:
Tests of stool for a few days.
Tests of blood: CBC, sugar,
blood culture and sensitivity.
Get a course of an antibiotic,
metronidazole.
Add on probiotics, activated charcoal, banana, curds or yogurt.
Plenty of oral fluids and electrolyte solution to counter
dehydration and
electrolyte imbalance.