Respected Hakeem Sahab Assalamoalaikum! Here is a prescription for vomiting which my grandmother told. She makes it for her grand children for years and she never got medicine from doctor for this.

ھو الشافی: take few leaves of mint, one pinch of dry coriander grains, one piece of cinnamon, Sonf one spoon, sugar for sweetness and half of a lemon.  Method: put one cup of water on stove and when it become hot add mint, coriander, sonf, cinnamon and sugar and boil it till its color becomes like a Qehwa than remove from stove and stain and on warm stage, add juice of half of the lemon and give it to the patient. Repeat it 2 times a day. InshAllah, there will be no nausea and vomit again. It is very cheap and easy. (M.M, Bhakkar).