Missing Period, Starting To Freak Out, Please Help

Okay, Last month[September], I started 2 days early. And this month, I have NOTHING.. I was suppose to start on the 5th.. But nothing, my moms saying it might be stress. But I m not real sure and I m starting to freak out a little. And I was recently told that I m anemic . Yes, I am a virgin. So no I can t be pregnant . On the 4th, I thought I was gonna start cause I got really bad cramps like I always do before I start. And ever since then I ve been having cramps like every few days... I ve had my period for the past 5 years. I ve been on birth control before and then stopped taking it because it made me have really bad stomach pains. And I don t take any medicine for anything besides the stuff that prescribed to me.. I HATE TAKING DRUGS.. I m freaking out because my older sisters all have some kind of cystic . And I m 16... I ll be 17 in January.. And for colonita. My mom hasn t took me to the doctor . For the simple fact that I hate doctors hospitals, having to wait for like and hour just to be seen.