hello welcome to HCM,
as you are having thyroid
problem , you should not stop thyroxine
tablet as you wish , until your doctor asks you to do so. there are two reasons for the missed periods
1. you are rectly married , so check ur urine for pregnency
2. becoz of stopping thyroxine pill,why becoz thyroxine plays a vital role in menstrual cycles.
so go your physician and chech your thyroid status by taking TF3, FT4, and TSH
TAKE CARE BYE..