Sometimes the blood tests are in the normal range, but you may still exhibit symptoms. It is important to get more testing done, especially basal temperature testing (you can do that yourself with a basal thermometer), possibly a thyroid scan or ultrasound. I have hypothyroid symptoms too and my TSH was high, my Free T4 borderline low, and the doctor said I'm "normal" but I have all the symptoms too. I'm planning to do more research and find a doctor, like an osteopath or endocrinologist, that might be more open-minded and willing to do more investigation. I do really feel like the the hypothyroid diagnoses ties all my symptoms together: from eczema, allergies, mild asthma, carpal tunnel, digestion problems -- to the more commons symptoms of fatigue, hair loss, menstrual problems and unexplainable weight gain that doesn't respond to exercise and diet. One thing I found out is that soy and flouride both have depressing effects on the thyroid, so the first thing you can do is drink purified water, cut out soy and use non-flouride toothpaste.

You may have to go to more than one doctor and rule out other things, like adrenal fatigue, diabetes, CFS, etc. that may have similar symptoms. There are many good books on hypothyroid. Google Mary Shomon as a starting point.

I found these links to be helpful: test ranges for common thyroid tests and recommended doctors in your area.

I found out from research that non all low thyroid patients can be diagnosed with tests, the tests just aren't that sophisticated yet. So if you are feeling sick, look for a doctor who is more open to working with you and not just telling you your bloodwork is normal and leaving it at that -- like my doctor did. Also there are other conditions which can look like low thyroid, so if you aren't feeling well, I think it's irresponsible of a doctor to just run a couple thyroid tests to rule that out and not investigate further. But frequently, as patients we have to be our own advocates.

Test ranges:
http://thyroid.about.com/cs/newsinfo/l/bltest_values.htm

State-by-state doctors:
http://thyroid.about.com/cs/doctors/a/topdocs.htm