My 80yr aunt has been vomiting, a little bit of diahareha , slight fever and complaining of acid reflux, heart burn and burning stomach? what is this?

Gastroenteritis or ?: Most cases of viral gastroenteritis are mild, self-limited, and not life threatening. These resolve on their own with supportive care (drink fluids to prevent dehydration, eat moderately as tolerated, as needed analgesia). In special cases (newborns, elderly, debilitated) hospitalization may be required to provide IV fluids and to support co-morbid medical conditions.