Hi I'm 16 almost 17 years old and I haven't had my period in over a year. The very first time I got it was the last time I got it. It was normal and lasted for 7 days. But now it's been over a year since then and I'm not sure what to do. My mom doesn't think it's a problem but I'm pretty sure it is. I'm 5'0 and about 110 pounds if that helps. I also had an eating disorder 4 years ago so could that be the cause of this problem? I'm not sure what to do. Please help me.