You could try a different brand of Tamoxifen. Sometimes that helps. I switched brands and noticed a big difference within a week. However, I was about 12 months further down the track so time could play a factor in there as well.
It's also a lot worse if you had chemo induced menopause as well.. Unfortunately none of the menopause supplements are recommended for ER+ BC.
One of those cool towels is helpful as well. If you wet them and put it in the freezer for a few minutes they will calm the flushes down. I also carried ample supply of Dove deodarant that I spray down my shirt as soon as I feel them coming. That gives them a little knock as well.
All the best lovely. They truly suck.
xoxox