On your last blood work, what was your Total T and Free T. Include ranges.
If your total T is barely in range your Free T could be quite low. FT is what works for us, total doesn't really matter.
On your next blood work make sure you get all the normal crap plus, LH, FSH, thyroid panel to include TSH, FT3, FT4 and RT3 plus antibodies if the doc will allow it. SHBG would be great as well as Vit D.