Hello from the UK...
I was diagnosed (finally) as hyperthyroid last year. Once the medication had kicked in, I felt better than I had done since I was about 18 (I'm now 35). Over the years I had been to see my GP with almost every symptom of hyperthyroidism and I had a couple of tests for this condition, which came back in the normal range.
Having now 'recovered' and been off the medication for several months, I now have all the symptoms again and again my blood test has come back normal. However, this time, I know that I am hyperthyroid and my consultant has agreed to give me a low dose of medication (almost a miracle). What I have come to realise is this; I am outside of the standard deviation, i.e. what is Joe and Jane Blog's normal range is not mine.
My lab resut for the first T test they do here in the UK was 0.9 (in the UK, if this T test is normal they will not do the other T tests!).
I think the misdiagnosis of essential tremor has probably been the most devastating to me - and was made by my GP, not a Consultant. When the tremor dissapeared once I had been on the medication for a while, well, I can not describe the joy. Plus the fatigue is pretty miserable too. Now that I have had a period without these symptoms (and the many others - profuse sweating, palpitations, eye problems, muscle weakness, breathlessness, lump in throat, always on the loo - I could go on and on), there is no way I am going to accept them again, just because my blood test results are in the normal range.
I would just like to mention that my Consultant said that low ferritin levels (which I have) are not linked to the thyroid - yet I have read that this is not true. Mind you, my GP once told me that the reason my eyes shook in the mornings was because I lacked potassium - this was without testing my potassium levels, yes really!!! Also, I am sure I have Grave's disease but have never actually been told what has caused me to be hyperthyroid. Oh well, you have medical insurance we have the NHS!