Your post caught my eye because I also have an adrenal tumour and I was investigated all through my 40s for palpitations that had no apparant cause. Noone has ever said to me they might be linked, although common sense suggests a link. I've been on the list for an CT scan since July last year as my adrenal tumour hasn't been viewed since 2016 when it was 10mm.
It seems menopause was the cause of my palpitations, I didn't think oestrogen helped me much at all. I had Evorel patches, no good. Estradot patches, some benefits. Oestrogel, wow, that was so strong compared to the patches for me, but still wasn't quite right, in fact it might have increased my palpatations.
Now I take tibolone and whether that is the cure or whether it's the THC, something has completely resolved my palpatations!
So palpatations began in my late thirties and ended with me starting tibolone age 52.
The other advantage of tibolone, (apart from my GP saying "it's the safe one we can give to anyone", not what google says btw), is that there is no need to endure the progesterone days AT ALL!!!
As well as hormone replacement and bone protection, Tibolone acts as a significant antidepressant and boosts libido, it's the ONLY medicine with testosterone, as well as the other two hormones, that is licensed for women in the UK.
It's significantly better than the various oestrogen and progesterone preparations, it is much more complete and natural feeling, I know I'm lucky to have been offered it.