It takes a while for the new dose to take effect as I'm sure you know.
It could be your ovaries finally packed up after years of peri and you're replacing all of the oestrogen now, you know something changed.
I can't sleep taking Utrogestan or for a few days after it and taking Utrogestan cancels out some of the good effects of Oestrogel for me.(I'm on 3 pumps and Utrogestan 200mg vaginally for 12 days)
The hot flushes day or night creep back during Utrogestan days and I've wondered if taking 100mg continuously would settle things and maybe it's fluctuations causing my problems.
It seems odd to switch you to 12 days at your age, also my age, most get switched to continuous at this age. Was it to regulate your periods?
I found my periods don't care much when I take Utrogestan, my cycle isn't quite overridden, but despite having a cycle, I don't bleed now unless forced by HRT.
PS, I meant to say I feel really anxious lying awake with utrogestan and it carries into the next day, but mornings are always when I get the majority of the bad symptoms, hormone levels are highest then pre-menopause, but I don't know about in menopause.