For me a clinical depression hit me in early 50's right after menopause and I went 10 friggin yrs trying to get help from docs about thyroid and they all kept saying "you are good, numbers are good", I AM NOT A NUMBER. It's symptoms.... and they kept dishing out A/D drugs for 10 yrs...it was thyroid, my good ole D.O. found when I finally asked him about thyroid..he worked with my back for years...but he is/was a M.D. and he knew immediately. He was one in a million and a godsend in my life.
Yes you could try some thyroid supplements, there are many out there...NutriMed has a nice line but I've never gone on them. You can go to amazon and google thyroid supplements and see what you get, read the reviews for sure... NutriMed has a site and I've read it a lot.
And consider Grape Seed Extract as I've been taking it 25 yrs, no brain fog.