my daughter is 4 yrs 6 months, yesterday morning she woke up saying she felt like vomiting , what came out was a little yellow liquid , then later she passed semi solid stool , vomited again after having lunch, but was fine later,today she woke up with a stomach ache and again passed semi solid stool, vomited at 5pm after having banana, all tht came out was the banana............ plz help