I have early stage invasive lobular carcinoma in both breasts. It is estrogen positive. I am 55 years old and perimenopausal. My doctor and I have discussed options and I am pretty sure that I want the double mastectomy, with some immediate reconstruction (no implants). Do you suggest taking Tamoxifen? I'd like to avoid it if possible, since I already get headaches, hot flashes, insomnia, mood problems, etc.