Perimenopause took about 10 years for me, my 40's. I would get depressed/suicidal during my periods in my 20's and some of that started again (more "emotions") during my 40's but at only about 1/2 strength, very subtle. Remember there are all sorts of hormone changes happening and that can cause depression; I'm on thyroid meds now (not for depression but low thyroid can certainly cause depression).