I am on tamoxifen and Zoladex. I am a bit older than you and was peri menopausal when I was diagnosed in September 2017. I dont really know the statistics but my oncologist was very keen for me to take Zoladex. My understanding is that it puts you in a medical menopause within 3 weeks! Initially I had nausea and heavy legs (hard to say if side effect from Zoladex or Tamoxifen). I still have hot flushes and leg cramps (controlled by taking magnesium tablet) and everything is manageable. I also get a low mood sometimes but think thats the Tamoxifen. I have the zoladex injected by a nurse at my Doctors practice. Its a bit painful (sorry) but you get used to it.
Hope this helps & if you would like to know any more then let me know. Michele