Well.sweetie,
My personal feeling is its hormonal adjustments and life problems both, and for me, my ability to cope has certainly lessened. To be fair, the last 18 months have been truly dire both personal and health reasons. Someone on here said they had lost trust in how their own body was behaving and that rings true for me. It's been quite a task adjusting to and attempting to accept some huge life changes, so in some ways I have had to simplify my life as best I can to cope with the anxiety. Bloody nightmare at times isn't it?
But this week I did write a list of positive changes, and my physical peri symptoms have all but gone, my general anxiety and horrific mood swings are improved, so I find it important to remind myself of how I was a few months ago compared to how I am now. Other things are rocky but peri wise has stabilised ( for now!) More bad pms rather than scarily black moods the biggest alteration. So all in all, positive.
Take care xx