The easiest and least expensive way to ease hot flashes is to reduce inflammation in the body by eliminating sugar and foods that metabolize as sugar (alcohol, etc.). For other tips on managing hormones naturally (men and women), go to: http://lagunanaturalhealth.com/hormones.htm (the site needs updating in a big way, but the hormone information is current.)
As an acupuncturist and Chinese herbalist, I work with a lot of women who have hot flashes and night sweats due to menopause. The combination of acupuncture and herbs is very effective for most women -- I have seen people get a tremendous amount of relief in a short time. Herbal formulas are tailored to your specific symptoms and overall constitution, and help your body regulate itself (rather than simply adding hormones into the system, as HRT does).
Migraines are also very responsive to acupuncture treatment; Tina is right that seeing a practitioner should be able to help with both of these things. Chinese medicine always treats the underlying imbalance causing symptoms, and it is likely that the hot flashes and migraines are somehow related.
Since hormones area definite no-no for you, I would highly suggest seeing a practitioner of some kind - naturopath, homeopath, doctor of Chinese medicine. Many herbs have estrogen-like effects and although they are not nearly as potent as prescription horomes, you really can't be too careful. Especially with your history of (what sounds like) severe migraines.
There are many options for hot flashes -- herbs, homeopathic medicines, acupunture.
Nutrition also makes a really big difference for most of my patients. Common foods/beverages that often make hot flashes worse are sugar, dairy, caffeine and alcohol.
It is also important to know that emotions play a definite role in hot flahes for many women as well, especially suppressed emotions. A lot of women have a lifetime of anger and other negative emotions that they have been suppressing for a variety of reasons. Addressing these emotions (Emotional Freedom Technique, Body Talk, psychotherapy, counselling) and learning how to process them has really helped a lot of women.
A bonus: if you do end up visiting a practitioner, they should be able to help with your migraines as well, and any other health issues that are bothering you.
If you can't get to see a professional homeopath for an individualised prescription tailored to your particular character and symptoms, you could try a combination homeopathic remedy called Am nit/Lach/Sep 6c, taken three times daily for a few days. It's available from any good homeopathic pharmacy, or from your local homeopath, or from homeopaths like me who treat people all around the world.
This remedy can help the symptoms, but for best results a properly-prescribed homeopathic constitutional remedy usually does the trick (and can help with any other distressing emotional or physical symptoms of menopause).
Meno-herbs are also helpful as support, and I often suggest them to underpin a homeopathic prescription.
I hope you'll soon be hot flash-free!
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