Hi Mermaidmad, These references may explain why you are feeling underactive again. Did you have your FT3 tested? You can buy the British Medical Association book, Family Doctor Guide to Thyroid Disorders,
by Dr. Anthony Toft from your chemist, or send for it on the Internet and then you can show your doctor.
“First of all, TSH is not a blood pressure. Blood pressure is a surrogate endpoint for clinical effectiveness and blood pressure has been correlated with mortality and morbidity. TSH has not been correlated in any prospective study that I’m aware of with clinical symptomatology of thyroid disease. (Toft A. Which thyroxine? Thyroid 2005; 15:124-6)
Thyroid function tests and hypothyroidism
Dr. A. Toft
BMJ 2003;326:1087 (17 May, doi:10.1136/bmj.326.7398.1087
However, some achieve a sense of wellbeing only when serum thyroid stimulating hormone is suppressed, when we take care to ensure that serum triiodothyronine is unequivocally normal.’
British Medical Association book, Family Doctor Guide to Thyroid Disorders,
by Dr. Anthony Toft (former physician to the Queen) where he states,
‘In the paragraph, Thyroid Blood Tests, Dr. Toft states that, " Typical results would be FT4 24 pmol/l and TSH of 0.2. In some patients a sense of well-being is achieved only when FT4 is raised, e.g. 30 pmol/l and TSH is low or undetectable. In this circumstance, it is essential that the T3 level in the blood is unequivocally normal in order to avoid hyperthyroidism."