Cortisol!!! I discovered this one by using a dab of hydrocortisone cream giving me a huge energy burst in the morning. Dr prescribed later.

The best place for checking my thyroid is my big toes, I guess the bigger nail bed makes it more obvious.

B12, even though tests in the middle of normal I was advised to supplement a small amount, also selenium (eggs are a good source).

Iodine also, I declined this one since I eat tons of salt.

Free T3 test is actually fT3 and reverse T3. Since you diet all the time that can be lowered even in thyroid normal people. 50 carb diet is recommended if you tend toward this.

Don't forget ferritin.

Stop the thyroid madness (STTM) has everything you need to know about thyroid.