I missed my periods and not pregnant
I am 18 and 5 foot 4 and my last periods was in May 2010 ,Today is August and still no periods.I have cramps and menstrual symptoms but no periods.It's all began when I started a diet I use to weight 145 pounds and on June I weighted 120.I was stressed and unhappy then on July 22 I decided to eat and now I weight 135 pounds but still no periods? Will the ever come back? And just to let you know I am a virgin and never had any sex, didn't take any pills and I am not athletic .Please help