Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain the symptoms of loose motions along with vomiting can be due to causes like : 1.Viral gastroenteritis. 2.Food poisoning. 3.Parasitic infestation. 4.Food intolerance or food allergies, 5.Electrolyte imbalance etc.. As of now HE should start taking anti diarrhea medication like Loperaminde or Furazolidone.. Take Ondensarton to relieve vomiting.. Take fluid replacement therapy that is drink plenty of oral rehydration salts by dissolving in water. Eating is a must and should eat small portion of light and semisolid food every 2 hours.. Take more of banana, yoghurt, rice and cereals.. In case of no resolution in next 3 to 4 days consult a Gastroenterologist and get evaluated and a thorough clinical evaluation and investigations like blood tests and stool culture can help in diagnosis and treatment can be done accordingly.. You can be advised antibiotics, Albendazole etc depending upon the cause diagnosed.. If it is due to food allergies the cause will be ruled out and eliminated from your diet.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.