Sadly, this doctor has zero business treating human beings. As Will said above, "Just wow."
The TSH test was not developed until the 1970's, it measures something called "thyroid stimulating hormone". It does not measure actual thyroid hormone at all. In a perfect world, if your thyroid gland is stimulated, it should produce thyroid hormone. But along the way, things can go wrong, so even is the TSH test is completly normal, the patient can still be very low in actual thyroid hormone. So, a good doctor might look at the TSH, but if the patient has complaints of coldness, lack of energy, unexplained weight gain, sluggish reflexes, sleeping issues, libido issues, the doctor SHOULD pull a complete thyroid panel....and this would include the all important FT3 test....this last measures the actual unbound honest-to-goodness thyroid hormone that's available to circulate throughout your body. It's the gasoline that helps your cells and body function.
One of our dogs has a chronic illness, and once a year our vet pulls a full thyroid panel. It costs me plenty, but even our vet knows to pull a full panel. That's for our dog....you deserve as much.
There is an excellent book you can get at Amazon. You can buy a used copy, it's an easy read. It's called "Hypothyroism, The Unsuspected Illness" by Dr. Broda Barnes. It will open your eyes about all the thyroid gland is responsible for in the human body.
https://www.amazon.com/Hypothyroidi...swatch_0?_encoding=UTF8&qid=1531930190&sr=8-1
I would go to Dr. Saya, he understands how to treat an actual human being.