Morning
no, 39 is not too young... That is about the time I began to feel slight changes, I am now 50 and still having them :) although....... that which has helped me through is learning more about my cycle and what to expect.. Initially, I thought I knew exactly what my body was doing each month, but as hot flashes, anxiety and mood swings began to take hold, I began to seek out more info.. which led me to a book written by Dr. Elizabeth Vliet, it's called of all things, "screaming to be heard" .... the title comes from the fact that most doctors often disregard what a woman is saying in terms of her health.... in the book, she details what to expect at each age.. in my case, my menstruation became really heavy (turns out, it was fibroids) and although never claustrophobic before, I was now experiencing such symptoms... come to find out, this had a lot to do with a drop in my Estrogen levels (which controls the cortisol) and therefore, when estrogen drops off, cortisol can run amuck) which for me meant major anxiety..
Since reading that book and for the last several years, tracking my monthly cycle, I now know what to expect or at least have a good idea... it doesn't take away all the symptoms, but when I am having them at least I know that in part, it's due to a hormonal shift.. for example.. if all of a sudden I have a sharp spike in mood, I now know I am not going crazy :) but rather that my estrogen or progesterone just shifted a bit...just by knowing this, when I feel a mood coming on.... I can tell myself.. ok this truly is hormonal and I can deal with it... It's not a cure all.. but knowledge is definitely power..... No doctor has helped me with "the change" in terms of really understanding my body.. instead, most want to give you antidepressant drugs or hormone therapy... after reading that book, I became very empowered... I think if you can better understand the intricacies of your body, the change won't be so bad.. or bad at all..
wishing you all the best..