There is a tremendous amount of hypothyroidism going largely undiagnosed because doctors are still mainly relying on the incomplete picture of the TSH test. Furthermore, women using estrogen are more susceptible to thyroid problems. That probably explains why so many sisters in the Hormone Jungle have problems. Better yet find a doctor experienced in treating thyroid problems. I've read that free T3 and free T4 should be tested.
Doctors still seem unwilling to prescribe it, however, thinking it is old fashioned.
Also for us women that seem to have some trouble converting T4 to T3, according to Mary Shomon's site, we do need to add selenium to our supplements. Selenium aids in the conversion of T4 to T3. I've got low thyroid too, so Janie's story is close to my heart. Thyroid replacement makes so much difference if you need it. It really is amazing after a few weeks how much better you feel.