You need to run more tests, like free T3 and free T4 (these are the hormones elaborated by the thyroid), maybe also anti-thyrogobulin antibodies (thyrogobulin is the protein that carries the thyroid hormones in the blood; if your body has antibodies against this protein it William produce thyroid problems). Other probable causes: dehydration (make sure you get around 2 L of fluids/day), anemia (especially if you have family history, have heavy menstrual bleeding), stress, excess caffeine intake.
Please follow up with your treating physician for a complete evaluation and management.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.