I crave alcohol very much before my period. mostly wine. how come?

I suspect: You have some level of an alcohol issue. The premenstrual period gives your brain physical or psycholohical triggers to want the drug (alchohol is a drug).

Hormonal?: I can imagine it's hormonal in some way. Maybe alcohol helps your cramps. Sometimes it seems that our bodies crave what it needs. For example, my wife who never eats red meat, craved red meat while she was pregnant-i guess to help boost her iron levels.