You can try black cohosh, increasing soy intake, some of the combo supplements. There was a warning about black cohosh awhile ago, I don't recall what it was.

Those worked for me for awhile, but I ended up on HRT. I have the Vivelle dot and I take prometrium at night. Just being able to sleep is great. I had the kind of hot flashes where you drip. I mean, even my calves would sweat. Luckily, I'm a student & spend my days in front of this computer by myself, so I can turn up the fan & take off my clothes.