Hi and welcome to HCM!
Thanks for posting your query here.
is not only the cause for absence of periods-amenorrhea
. Many conditions like PCOS
disorders, fibroids, uterine anomalies will cause amenorrhea. Craving for food, feeling sick and tired, dizzy spells shows a low nutritive value in the body. In women it could be anaemia-where it could be iron deficient status. A Hb status below 11mg/dl shows the anaemic condition. This can be overcome by oral iron and folic acid
supplementation. One tablet dialy for 3-4 months will restore the body iron stores also.
Please do a blood work which will give the clue for the diagnosis.
Hope this is helpful to you.