Ok. First a stroke is not likely, it will not be in the basic differential diagnosis for these particular set of symptoms. And is kind of scary to say something like that to a 20 yo girl.
I will consider first Migraine (classic subtype), vascular headache, Horton´s headache, trigemial neuralgia, stress headache. All of them are not mortal diseases but are really dificult to diferentiate without an appropiate clinical evaluation.
You must go to a Doctor of your trust.
My particular guess without having more information and using my experience will be migraine. They are painfull stubborn diseases that are sometimes difficult to control and need long term treatments.
I´ve seen many patients that auto prescribe them selves mulitple over the counter drugs, and te only thing they do is delay an appropiate diagnosis and suffer for weeks or moths without need.
The are other nasty diseases that can cause similar symptoms but are rare and usually give more symptoms, and considering the your background i wouldnt bother yet for such yet.
So stay calm and make an appointment.