Falling “sick” two days a month? Yeah, sure. Clearly an excuse to not do any work.
You go donate a bottle of blood and come home and take rest and eat iron-rich food etc. to make up for the loss. Women lose their blood every month (ever wonder about about the number of bottles thus lost?) and walk about and do their chores and continue as though nothing has happened. (They are expected to pretend that nothing has happened.)
Not to speak of the hormones flying all over the place when this thing starts. If you haven’t experienced it, you have no idea what you’re missing. A monthly journey to the edge of madness and back.
And if you haven’t experienced it, better not make any comment on how PMS and the associated fuss are all in someone’s head!