Can St. John S Wart And Estroven Cause Hot Flashes And Night Sweats?

So, I m 45 and have had hot flashes, night sweats etc. for the last 5 years. When I spoke to my gyn about it he just dismissed it and said not likely it was perimenopause. My periods have ALWAYS been regular, every 28 days, my last period was one week early March 31st and I haven t had one yet. Can menopause really be this simple. I just started taking St. John s wart and estroven because I have been extremely fatigued and now I think I know why....So will I stop completely? I just want to know what to expect....THANKS!