Surgical menopause in 2008 - although I was already perimenopausal at that time. While my hot flashes appear to be milder than what I've heard described, they have decreased quite a lot. I do find that I tolerate heat much better than I once did and and MUCH more sensitive to the cold than I once was. Unsure if this is related at all, I also dropped from 210 to 124 pounds so who can say for sure what's changed my temperature tolerances.