Your query stems from the unfortunate fact that most people (including highly qualified doctors) are not aware of the condition called "conversion disorder" which is fainting
due to psychological cause. Even in the emergency rooms, ignorant doctors use ammonia thinking that the patient is acting or malingering
. Ammonia is an irritant gas (can even cause burns) and it should not be used on any patient.
It is advisable to consult a psychiatrist
because, more than the problem of fainting, it is the underlying psychological stress
that needs to be addressed.