Hi shari, I was in hypothyroidism for four years before my former GP reacted. I had a lot of the symptoms - hair loss (permanently lost my eyebrows), tiredness, constipation, puffy eyes - but she kept telling me my bloods were OK.
It was only when I asked for copies of my results that I could see what was going on.
I know this sounds a bit complicated, but there are two elements in thyroid blood tests: thyroid hormones T3 & T4, and thyroid stimulating hormone (TSH). TSH is secreted by the pituitary gland in the base of the brain, and does what it says on the tin - it stimulates the thyroid to produce T3 & T4. Therefore an abnormally high TSH means the pituitary is having to work overtime to gun the thyroid into producing its own hormones, and vice versa.
There are two schools of thought among doctors about the thyroid. One - which my doctor subscribed to - is that as long as T3/T4 levels are OK, it doesn't matter how hard the pituitary is having to work to keep it that way. The other says that if TSH levels are very high, it's a sign of covert hypothyroidism that needs treating, even if T3 & T4 are OK.
The latter turned out to be the case for me. Although TSH levels aren't supposed to be more than 4.5mU/L (on the European scale) mine were consistently around 14 throughout that period, even though T3/T4 were low-side normal.
I eventually put pressure on her and she sent me to an endocrinologist, who did all the thyroid tests and prescribed a daily top-up of thyroid hormone. That was six years ago, and I've been feeling a lot better ever since.
There are valid reasons why some doctors are reluctant to treat minor hypothyroidism in older women. One is that giving a thyroid hormone supplement can further reduce bone density, and another is that it theoretically increases the risk of breast cancer. However, the former is treatable, and the latter risk is actually so small it's scarcely worth taking into consideration. In any case, I feel it's the patient who should make an informed decision as to which risks she's prepared to take.
Sometimes we need to ask polite questions of our doctors!