This is a male hormone forum.
There is a sticky here "thyroid basics" that may be helpful.
Please see the references there to optimal thyroid lab values, iodine, iodized salt and checking oral body temperatures to eval overall thyroid function. Also do some reading at "Stop The Thyroid Madness".
You can combat estrogen dominance by using progesterone cream. KAL brand found on Amazon works well. Women have declines of progesterone levels starting in their 30's. Symptoms are painful periods, breast pain, PMS etc.
If you had not been using iodized salt long term, that can be the cause of your problems.
You need TSH, fT3, fT4 labs. Some do not convert T4 meds ->> T3 effectively and may need a T4+T3 product.
You can use body temperatures as a guide to thyroid med dosing.