I Started Taking Tamoxifen A Few Weeks Ago And Was

I started taking Tamoxifen a few weeks ago and was told I should avoid phytoestrogens such as flaxseed, soy, etc. I have found lists on various websites listing those with the most and least amount of phytoestrogens. I have also seen a few sites that state it is better to take these foods if you have had breast cancer. I have had it twice...15 years ago on the left and this year on the right. I am confused about what to do. Should I show the different websites to my Dr.?