I haven't had a period in over a year. what should i do?

Go see your doctor: If you haven't had your period in over a year you have secondary amenorrhea. Secondary amenorrhea is when a woman who has had normal menstrual cycles stops getting her monthly period for three or more months. You need to be evaluated for this as a hormonal imbalance , thyroid condition or a number of other causes may need to be diagnosed and treated.