I am 30 yrs. old and have been dealing with amenorrhea for the past 18 months. Lab tests have come back normal. I have done the progesterone challenge which did result in menstruation. I tried regulating my cycle with birth control pills which did result in menstruation, but I also experienced headaches and nausea. I discontinued the birth control pills after 4 months and hoped that I would self regulate and I haven't. I have been researching herbal medicine i.e. chaste tree & black cohosh. Does anyone know if these herbs are safe & effective? Any other suggestions would be welcome.