In the past 3 years I lost my normal energy and felt most of hypothyroid symptoms, last year TSH was done first time and the result was 1.225 (ref. 0.470 - 4.640). A few months later, the doctor did other tests such as cortisol, insulin, adrenaline .. and TSH for the second time the were all normal (TSH was 0.572) and he concluded that all my endocrine system is normal and my symptoms are not related.
Three months ago, I went to another doctor to see why I have low heart rate, and they did TSH and found to be 0.2 and retested in two weeks to be 0.01 and after month, it is still in the 0.014-0.015 very low range but FT4 (1.43 N 0.8-1.75) and FT3 (3.31 N 2.3-4.2) are within normal ranges. They also did thyroid uptake which was very low 0.1% (N 0.4-4%).
I went back the first doctor and he still insist that my symptoms are not related to thyroid and I have a virus infection in my thyroid making it sub-clinically hyperthyroid which will go away soon wiht no medication needed. While my current doctor thinks it is a pituitary abnormality causing low TSH and under active (yet healthy) thyroid and he put me on levothyroxine 50 mcg initially for two months.
Antibodies test were negative and also MRI of my pituitary gland looks normal. I still have the symptoms with the most annoying one is adrenaline rush after 4 hours of sleep to wake me up and keep me a wake but fatigued till the night when I feel better and I can go back to sleep normal.
I would like to hear opinions about what I'm going through and someone tell me if anything I can do to make sure I'm going to the right direction!