I am aged 21, weight: 54 not married nor pregnant. I missed my menses last date was on 12 Oct it has been 51 days ,I feel the pain, the similar pain I get in menses, in my lower abdomen and back but no menses should I take any period induce if any ? and why is this condition? Is it serious? I used to consume a lot of cool beverages. generally pepsi which I stopped from a month I have a very little acne on my face. My skin has become dry I found fluctuations in my body size or weight, from I missed meal to when I take regular diet when I eat regular properly 3 times a day I look healthy. But when I miss it for 1 or 2 days suddenly I become thin I want to put on weight but I am scared about PCOS. What should I do to recover all my problems.