Any more ideas for hot flashes? I just stopped hormone replacement therapy - without it I have hot flashes. I have been taking them (HRT) since I was 39, now 71 yrs old. My oncologist told me to STOP. I am again having many hot flashes and I am not taking any medicine that causes hot flashes as a side effect. I am trying Black cohosh, how many days do I take that before it helps. Any more suggestions for me?