who do I believe

Hi Girls
on talking to my ONC last week, and asking advice on night sweats and flushes, she suggested that I take Sage, so off I go to a professional herbalist today to get some, luckily I told her that I have BC and am taking Tamoxifen, she threw her arms up in disbelieve when I told her that ONC said I could take it, and showed me her “Bible”, where it states in bold wording not to be taken by anyone who is taking Tamoxifen, she told me the only safe herbal med for me was Red Clover, she has asked me to speak to my ONC and inform her that she is given her patients the wrong information, any one else had this problem?, my BC is Eostrogen fed, which is why I have had to stop taking Black Cohosh which was working brilliantly for me.