Tested all hormones with university endocrinologist around 2009.
Free testosterone was significantly low.
Testosterone Replacement Therapy (TRT) via daily application of T-patches has been very effective in fighting my severe POIS since then, with periodic monitoring by my GP.
If you wish to consider TRT, please check out the fertility risks with your doctors! Somewhere along the line, my sperm count went to zero. (But I have grown children so it's ok).