Why is it that guys do not understand when it comes to having my period?

ok i get mad n annoying but i cant control it it's hormones you know...so when i say sorry for sthg stupid i've done then i blame it on my period (bec it's true) he's never convinced...he's not talking to me 4 a week now i said sorry alot but it doesnt make nething better!!! what should i do???