Hiya,
Snap I am also 47 and my periods are very similar to yours even on HRT. Can vary between 16-38 day cycle in consecutive months! They have been like this around three years. I’ve been on HRT almost a year and it’s helped a lot. But it’s not doing anything at all to my cycle! I use Evorel patches and separate utrogestan.
I’ve had a few good months recently but this month has been dreadful. Mood is OK ish but awful hot flushes, nausea, dizziness, night sweats and tiredness breaking through. Also quite irritable! But it is hot and the school holidays and I am a creature of routine ….
I’ve just decided to ride it out for now and see what happens in the next few months. If no improvement may consider trying a higher patch. Because things have been manageable on the 50 patch I’m loathe to change anything really!
I do take an SNRI (have been on SSRI for 15 years but changed as it wasn’t working any more) - which I “chose” as I heard they are good for controlling hot flushes as well as anxiety/depression issues. It has been brilliant with the hot flushes to be fair. Until this month. I just think the fluctuations are too much sometimes.