how to rescue immediately when with hypotension low bp or when you feel like faint

this is caused mainly for those who have too much tensions first thing to do is do not think about it much and have and have more tension when you fell like you gonna faint or felling like that take  
some water with some salt or even electrolysis powder in it,the person who is faint should be provided with air atleast by opening the windows and doors so these are things could be done