menopause symptoms usually start immediately. You will be fine until you can start hormone replacement although it might be uncomfortable at times. Research it on the internet. There are several things you can do to get past the temporary symptoms.

As soon as you are estrogen deficient, you will notice hot flashes, mood swings, irritability, etc. It may take a little longer for vaginal dryness, but by then you may have already started your hormone replacement therapy. Hope the surgery goes well. Good luck.