★★★★★
The serum TSH test is not a bad to start with, as it is better than nothing. But the test itself can be misleading; and the TSH is not even a thyroid hormone.
Once you convince yourself that indeed you are hypothyroid, then you will also need to find a doctor who is willing to prescribe a natural thyroid extract. However unfortunately the vast majority of so called doctors will not do that. Whenever they can, they will fight you and oppose you. They will also make sure the treatment you get is inadequate A) because they will drag their feet, and B) because they will treat your test results, as opposed to treating you.
I know, I know, all of this is a lot of hard work...
But your hair WILL GROW BACK!