Does anyone know which hormone it is that makes you feel depressed in the days leading up to the first day of bleeding? I've read you get a surge in Estrogen 7-10 days before period, then that drops and you get a surge in Progesterone 5 days before. I wander what exactly makes you feel bad, i know its the hormone imbalance but is it the surge of one of the two? or is it the sudden drop in one of the two? the progesterone or the estrogen?