One thing I wish I'd thought about/known when I got older (I'm 65 now :-) was that the moods/problems of my 20's would be reflected in my peri-menopause in my 40's! I was pretty good in my 30's but then went back to being mildly (less so than in my 20's) depressed before my period, moody, etc. It took me quite a few years before I saw the relationship to how I'd been teens/20's.