my boy vomiting after crying...once he cried after food then he vomiting...long travelling in the car then he said I m feeling vomiting sensation...sometime he vomiting throughout the travelling...most of the early morning we start the travel he vomiting frequently throughout the travel...night time also sometime he wakeup and vomiting once then he gng to sleep well...when he eat dosai then he vomiting at night...wats the problem sir wat I do..please help me he is now 4 years