Why do doctors say no? Because herbs are not in their ballpark. Most doctors are, I believe, caring individuals, but they are human. They follow rule books. Mostly, though not always, if they do not, then people get hurt. In their world, those rules are established through protocols. For a variety if reasons, those protocols do not cover herbs.
But, in general, doctors will always frown on DIY hormone therapy of anykind. Why? Because there are many people in need of assistance who will make often serious mistakes in treating themselves. And doctors are usually then left to clean up the results. Sure, there are lots of us quite bright enough and competant enough to educate ourselves, learn the uses, benefits, risks and other pitfalls of self medication. But this board alone often provides ample proof that there are also many out there quite unprepared to go it alone, and who sometimes cause great harm to themselves (and others) by entering into self administered treatment for which they are vastly unprepared. I do not say this to offend anyone, and I hope I have not. But just as in home improvement, there are those quite able to fix a leaking pipe and there are those who will try and only end up flooding their basement.
I think, honey, doctors get tired of being called in the middle of the night to drain the basement.

Hugs