Hey! Can't particularly help, sorry, but wanted to say I'm in the same boat. Surgical menopause at 37. Been on Evorel 75mcg, testim and Mirena for 3 years but 2 months ago I just started feeling rubbish - exactly as you have described. Saw my meno specialist in Mr Panay's clinic today who said more estrogen so now I'm on a 100mcg patch.
I get the beyond tired thing and I too am hoping that the estrogen will help.
Talk about zing and energy for exercise - I am a weightlifter who hasn't trained properly for 3 weeks because of this and it is getting me down.
Weirdly the meno specialist today said that as I'm now 41 it's possible that my body is in peri-menopause. I said how on earth given I've been in surgical meno for 3 years and apparently just because you don't have ovaries anymore there are other bits of the body that produce estrogen and this might have started kicking in now? Maybe the same for you? Kind of sorta makes sense, I guess the brain/other parts of the body don't know your ovaries are missing and aging still affects us?
Anyway, I am so relieved to have got a sensible diagnosis and some help today (GP gave me ANTIBIOTICS for an infection, WTF?!) and I am sure that you are also going to get better.
Keep chatting, if nothing else, we are not alone