I also have suffered the hot flashes, night sweats and such off and on the past 3-4 years. I tried black cohash and that didn't work real well, but with all the cancer in my family I refused to go on the hormone replacement. About 1-2 months ago my DH and I started taking B complex with Vit C to get our energy up. I'm not sure if it was this or the 'end' of my hot flashes and night sweats, but I'm not having any of that stuff any more. I also started walking more, drinking a lot more water and taking biotin, so I'm not sure if it was just me or what. All that I can say is 'Yahoo!!' and I'm not willing to stop what I'm doing to find out if that is what has helped.
Good luck on finding out what works for you. I know it's miserable until it stops....