J.W.
I do not know what precise tests you were given but I wanted to share that my child was repeatedly sent to endocrinologists who repeatedly told us that "everything is normal." Yet they were testing just TSH instead of actually testing ALL her thyroid hormones, as well as a multitude of other hormones and nutrients associated with the thyroid. They thus MISSED for YEARS that she actually had a different type of hypothyroidism.
She also had symptoms of thinning, brittle hair and nails... she had dry skin, fatigue, pains... Once she got diagnosed with "depression", it's like everything else got chalked up to being "mental."
Later, when she should have started menstruating, she didn't.
You might want to check out books by Mary Shomon, and http://thyroid.about.com/
Also, she had other problems that probably contributed to the endocrine problems because she had a bunch of low hormones like a peri-menopausal woman. Poor sleep, excessive stress, intestinal malabsorption, allergies acn all put extreme stress on the endocrine system (the hypothalamic-pituitary-adrenal axis). She had it all. For one thing, she had gluten intolerance/Celiac, and sleep disorders.
We wasted so many years of her life and really diminished health and quality of life with doctors just treating mental illness (www.itsnotmental.com).
By the way, she met the criteria for both chronic fatigue and fibromyalgia.
(She's doing well now)