there has been loads of messages about this subject in the past ( you may have to go back to ones from last year ), and it would seem to be quite common for anxiety to be linked with changes in hormone levels, period times or menopause are the most common. I've read loads about it in relation to the menopause and papers seem to suggest a direct link between the two. I'm now on HRT and have almost been panic free since I first starting taking it. See if you can find the previous messages, or just put panic / hormone into google and see what it comes up with. Good luck ! I found it a fascinating subject to research !!
