welcome to hcm
with the history given its not possible to diagnose the exact condition but still if you have attained menarche
that is if started getting your periods than its could be due to some other reason if u are not getting your periods it might be related to your menarche.
if you have attained you periods than this pain could be any thing related with gastric problems or stones or any related thing.
if u have sever pain kindly consult the gynecologist as early possible for good out come.
dr. vikas poddar