Clonidine
"Started my menopause late 30's. I am very fit and thought I would sail through it! Instead I had so many hot flashes day and night plus anxiety and vey bad insomnia so much so I could not function. Thankfully my husband was very patient and caring as I would get very moody and emotional. I am now 57 and still going through it and after trying quite a few things which did not work (not HRT) I was put on clonidine 4 years ago, thank goodness as I do not have half as many hot flushes, very few sleepless nights so I'm not tired which makes me very happy.  It obviously works for me and cannot believe I was not told about it sooner. I cannot remember having any side effects I.e dry mouth or headaches and I take 25mg a day."