Just a quick tip if you're suffering with constipation. Try eating kiwi fruit, one every other day should help. Apparently progesterone (and I know we're talking about oestrogen but I'm applying a peri woman's logic here!) causes slow transit, which basically means that your system works ok till it gets to the last bit, and then transit through the lower bowel slows right down. Drinking lots doesn't help by that point so you need to eat something that retains the moisture and has some fibre, and kiwi fruit seems to be the answer.
I tend to eat a satsuma every other day and that usually helps, but when I changed from Femoston to utrogestan and Lenzetto I suffered really badly with a slow bum, as I tend to coquettishly describe it..... I saw something about slow transit and kiwi fruit on a Facebook menopause group and tried it, and it works. Worth a go unless you dislike or are allergic to kiwi fruit.