Have you asked your gynecologist about this? Hot flashes are a symptom as are irregular periods, but, gosh, I think you are very young to enter perimenopause. Did your mom go through very early menopause? Have you taken your temp during the hot flashes? Maybe you are running a low grade fever? Also, it is pretty typical to cool off after a hot flash so the chills make sense. Good luck!
Hello Dear,
I think you hit the peri-menopause. As per your symptoms. Take proper diet food and add lots of vitamins to it. Do regular exercise this all will help you to take relief from menopause. Even you can go for some herbs like Red clover, chaste berry. this will help you to get relief from hot flesh.
Take care and live healthy life.
http://www.thebeautyinsiders.com/tips-in-healthy-living-during-and-after-menopause.html