Welcome to HCM,
After going through your query it is not clear that you have hypothyroidism
as all the TSH values are with in normal range and you are taking 25 Mcg thyroxine
. If it is given by doctor then you have to monitor TSH level
and adjust the dose some times it is inflammatory disease and patient may become Euthyroid.
In your case you should visit a Good Endocrinologist
and repeat Thyroid function FT3,FT4 and TSH along with anti Thyroglobin and Anti TPO test.
Depending on result a Ultrasonography
of thyroid and if required FNAC( Fine Needle Aspiration Cytology) may be performed.
Treatment depend on results of your tests.
Please do not start or stop thyroxine by yourself.