hi... I'm 16 years old and i had my periods when i was 13.. at first my periods were normal but after turning 15 i had my period after every 2 weeks.. which made me weak. i had to take medications to stop it n continued taking it for about 6 months. i had regular periods but then i did not have period for 6 months and again i did not have my periods for about 5 months but my period this time did not last even for a day. please give me suggestions