I remember when I was still a student, there is one day that I would be absent in school or cut classes because of my period, I am suffering severe dysmenorrhea before.
At work, sometimes I went home with the same reason. Now I am full time mom and housewife and thankful dysmenorrhea never attacks always.
Being at home helps the situation if you suffer so badly, school days most girls never mentioned a word, suffered in silence as was expected when I was growing up.
That's so sad, one of the suffering of some women.
Treated more equal, no excuses! If a doctors certificate was provided by the parents the school would comply, not left to the whim of parents or pupils.