Hi BK, so sorry to hear the Kyleena-Oestrogel combo hasn't done what you were hoping. You must be so fed up - been a long time trying to sort it. I know the Levonorgestrel in Kyleena is androgen derived so what I'm going to suggest now may not be the answer for you, but if you're thinking of going back to Utro did you ever try adding a little Testosterone to your regimen when you were on Utro before with whatever form of oestrogen? Or have your T & SHBG levels tested?
I'm thinking of what you said here, the italicised bits especially:-
My symptoms are very low mood, no interest in anything, permanent exhaustion, groggy head & headaches, difficulty concentrating & working, nausea, short tempered, zero libido, poor sleep quality and legs feel like lead - feeling like I’m 90 not 51!
I added T to my HRT a few months ago (postmeno with no ovaries so deficient in T, also on thyroid replacement) & have felt improvement in focus, mood, energy, libido & to some extent sleep.
Sorry if you already know this - I know you're pretty clued up, but hypothyroid women on replacement thyroid meds & oestrogen may struggle to maintain decent T levels because both exogenous oestrogen & exogenous thyroid hormones increase SHBG, effectively lowering Testosterone. You are on quite high E & thyroid replacement so I just wondered what you think?
I found the following link a bit technical but the relevant bit is:-
"Endogenous or exogenous thyroid hormones or estrogens increase SHBG levels. . . This process can result in bioavailable testosterone levels that are much lower than would be expected based on total testosterone measurements alone."
https://www.mayocliniclabs.com/test-catalog/Clinical+and+Interpretive/9285Please disregard it if you've tried T already. I couldn't read & not post tho, just in case.
Wx