I wonder how many people have made the connection between their depression and the change of life ? One thing that is a constant between men and women is the chemical imbalanced that often triggers depression, mood swings and anti social behaviours.
You could be pre-menopause (Andreapause for the guys) as early as 35-40 yrs of age. I've dated women that were going experiencing this in their late 30's, verified by their doctors... its not pretty since it can broadside you
Just something to think about...