i am always thirsty, i drink like 20 bottles of water a day. i feel weak, tired and see black when istand up. i also get heartburn. i have dry hair. i eat in a day cerial, 2 pieces of fruit, 2 rice cakes and dinner, maybe a tea. i do 45mins excersise a day. i dont get my periods. i flat chested. when i eat bread i have a stomache ache and diarreia.