How Can Irregular Period Due To Thyroid Issues Be Treated?

Hi, This is Reeta ,I have thyriod problem,means excesive,I had been facing irregular periods problem,Many times it takes more than 2-3 months.I have take medicines ,periods will become regular for that month,if I stop then same issue repeats,Iam married 3 years back,In month of March I was 2 months pregnant,I was put in Hospital for 6 days,I had stomach ache that time because of Gastric,preganancy is terminated on our own wish in hospital bacause of untolerable stomach ache. Actually when we done thyriod test like 1 year back,my thyriod is high,after pregancy terminated only I started using thyriod medicines daily one tablet.Even after using the thyriod medicines also,my periods are not regular,I supposed to have my periods May 9th ,and today is 19th not yet. Moreover day by day Iam becoming thin,loosing weight.feeling more weak,cant walk even 1km.loosing hair.too much tiredness. Iam worried what to do in this regard ,please suggest. And when ever I was going to hospital I was seeing only gynacolosit,not endroconligist. please help mail id: YYYY@YYYY Thanks Reeta