Can I ask how old you are?
For the past months, my periods have been acting weird; I skip one cycle, then they come back...now, it's been five weeks since my last period, and still no sign of it being on it's way. I'm 47, and this started about six months ago.
Five years ago, I was put on both E and P by a Hertoghe doctor. I was not peri-menopausal back then, but my doctor said that adrenal fatigue led to low E and P levels, as well as low cortisol levels. That's why I was prescribed Estrogel and Utrogestan (progesterone), along with Medrol for adrenal fatigue.
I have been doing really well on both E and P, and my periods have got lighter (before I took hormones, they were very heavy, lasting for about a week, and caused me to be anemic).
I am seeing my doctor in August, and will ask her if my meds need to be adjusted now that my periods are no longer regular. Even though the average woman has her last period at age 51, that can vary a lot...some have their last period before 40, others at 57. I also got my first period before age 12 (at 11 years and 10 months old, to be exact), and I am not sure if it's then logical that they stop earlier...?
I can recommend the book in question, as it explores all hormones and how they interact. Often, in my own experience, it's not enough to just replace one hormone.