What Causes Blood Clots, Migraines, Irregular Mestruation Ad Cold Sensitivity?
Thyroid
Detailed Answer:
Sorry to note your symptoms.
When I see someone like you in my practice, I tend to order the following tests:
CBC
CMP
TSH
Free T4
Thyroid antibodies (anti TPO and anti Thyroglobulin)
These tests help one decide if you truly have a permanently under active thyroid that necessitates treatment with lifelong medication .
If the tests suggest the possibility of 'Secondary' hypothyroidism ie an underactive thyroid gland due to insufficient pituitary TSH signal , then further tests such as blood prolactin levels and an MRI of the pituitary can be considered.
I see you are no medications. I mention this because there are some medications that can reduce the conversion of T4 to T3 in the body. Sometimes major stress such as hospitalization for critical illness can have similar effects ie decrease conversion of T4 to T3.
These may not necessarily require any direct treatment.
Good to note your biopsy was benign. Do you know the details of your thyroid ultrasound report?
Follow up
Detailed Answer:
As long as your TSH and free T4 are normal, it is almost certain that your thyroid is functioning normally.
Thyroid nodules are best monitored by an Endocrinologist who typically take many factors into consideration such as risk factors for thyroid cancer and nodule characteristics on ultrasound, before recommending any intervention or otherwise.