Estrogen?
I’ve had an embarrassingly minor go at menopause (just hit 1 year sans periods yay!) but my doctor and I still discussed HRT.
One thing I can say is I had a few random periods after my T2 diagnosis and my BG was totally wonky- weirdly, mostly lows during, but really just all over the board. So, I do think unpredictable BG goes with hormone fluctuations. Is the HRT still helping? If not, coming off of it may be a wild ride, but should settle down in time.