The only hormone replacement that ever made a difference for me, despite having low thyroid, low ACTH, low pregnenolone, low testosterone and low estrogen, was a low dose of cortisol. It mildly improved my energy for a few years, then stopped having an effect. I weaned off of it this year without adverse effect.
I hope your regimen continues to help you, but I recommend caution. Of course, it's extremely difficult to "take it easy" during medical training, but be aware of your body in case the stress starts to wear on you. The world of ME/CFS is filled with people who found "the answer" early only to relapse some time later. It happened to me. I was trying a variety of things, from diet to supplements to meditation and more when I suddenly got better (about 80%) during my 4th year of illness (while I was in medical school). The remission allowed me to finish med school and residency, but I relapsed 12 years after the remission began and have not recovered in the subsequent 12 years (I've been ill for almost 28 years now).