Hello, my name is XXXXX & I am 15 years old. I ve missed my period by a week & in the past 2 weeks, I ve noticed that I m feeling a little light headed, weak, my back & spine hurts, & I have these on & off stomach pain. It s not the kind where I go to the restroom, but when I get it, I feel really weak & shaky. Would you know what is going on?