C.R.
Well If the hot flashes are the ONLY symptom you are having it might be something other than perimenopause. Are you cycles still normal? I mean it is possible that is what you are going through but usually you also noticed other things like your cycles are off and either lighter or heaver than normal.
You could give your Ob a call and ask them. It's almost impossible for anyone to really know what you hormones status is since they are changing so much throughout the month so usually the diagnose is done by clinical symptoms instead of a blood test. My doctor told me to just go with it unless I start to bleed really bad or miss two periods and then call her.
I will give you my hormone help: Try natural progesterone cream! Honest that stuff saved my life and it's so much better than synthic homone treatment or low dose BC pills. Here is the one that I use: http://www.amazon.com/Emerita-Pro-Gest-Natural-Progestero...
Please check out the reviews.
It's not just for Perimenopause/Menopause but it's great for PMS too. You can get it at most health food stores or Sprouts if you have one close to you.
Best Regards,
C.