I'm BRAC II positive and went through breast cancer; double mastectomy, ovaries out, chemo, and four years of Tamoxifen. I'm off Tamoxifen now and my hair still won't grow. My oncologist thinks it is the lack of estrogen, but online blogs seem to state that too much estrogen makes women's hair fall out??? I got off rogaine because I didn't see much success, and of course, more hair fell out. I don't know what I should use???