The book is Before the Change - Taking Charge of Your Perimenopause by Ann Louise Gittleman.

I just bought it last week and learned so much. I thought that I was losing it but it looks like I am probably in Perimenopause. Apparently it can happen in your 30's and 40's - I am 45. I've got a doctor's appointment this week to hopefully get some more answers. My doctor is a woman so hopefully she will be on top of this stuff.