Ayurvedic medicine "Vilwadi Leham (Kottakal arya Vaidshala)" is very help in such Vomitings and gastrointestinal disorders.
Next Steps
You also need to observe what Food item is Causing the problem. It needs to be Avoided.
Also, check for worms.
Health Tips
Bakery items, packed foods like chips etc are harmful.
Out of season Fruits like having Apples at this time can also lead to Gases. Apples are good only in Winters. Hence, have only seasonal Fruits & Vegetables.