While menopause and perimenopause are certainly women's health issues, I'm going to refer you to the iVillage message board that deals specificially with that topic, Menopause & Perimenopause. Also, the community leaders of that board have put together a good web site to visit for more information, the Menopause Oasis.
Good luck in your quest to figure out whether it is menopause, and please stop by Women's Health Issues again if you have other questions or concerns, or just to say hi!
