Menopause and supplements

Hi everyone I’m needing some words of advice and I’m now having a slight panic attack, 5months ago I started ribociclib and before then and still on anastrozole from Oct. but since being on ribociclib I’ve gone into medical induced menopause, I spoke to my gp and told him about the hot sweats mainly and lack of sleep so he said to get a supplement with chaste tree in it. So I found one and it has been working really good  but now I’m afraid the work is undone if I shouldn’t be taking them, my oncologist scares me and I to afraid to tell him but I’m sure I mentioned it to his assistant and I think she said it was ok, I’m so overwhelmed and scared can anyone advise but I think I know the answer and I’m guessing I need to speak to him!