abnormal period adenomyosis adrenalin antidepressants antidepression bad stress cortisol depression depression causes depression forms depression in women depression light therapy depression symptoms depression treatment depression types distress dormitory effect Eustress fertile days fertilisation fertility fertilization good stress impending menstruation impending period late period McClintock effect menstrual cycle menstrual cycle phases menstrual pain menstrual period menstrual synchronicity menstrual synchrony missed period noradrenalin oligomenorrhea ovulation PMS positive stress premenstrual syndrome stress stress and cancer stress balls stress hormones synchronized periods