I'm almost eighteen and have had a regular period cycle for about five years. I've never been more than one week late for my period, except when I was pregnant (I had a misscarriage). It has been fifty days since my last period (so I've missed two full periods). I am definitely not pregnant. I haven't had any kind of sexual activity for about nine or ten months. I am having stomach and lower abdominal pains regularly (five or six times a day at least). I'm also having really bad pain in my right hip joint, although it might be totally unrelated).  I'm not that overweight (I'm white, 5'2, 130 pounds) and I haven't had any recent weight gain or loss. I have a pretty balanced diet between junk food and healthy food. I'm not sure what's going on and I am planning on going to a doctor but I thought it wouldn't hurt to see if anyone on here has experienced anything like this or knows about it. Thanks!     Anna