You've certainly got your hands full! I can see that you want to enjoy your girls and it must be very frustrating to have no energy etc. I'm sixty three now and my sons were grown up when I was your age but I still remember how annoyed I was that I couldn't function the same as I always had.
You say that Vagifem didn't work. How long did you use it for? The dosage was changed a few years ago and a lot of women find that they have to use more than prescribed to get the same effect. Unfortunately once vaginal discomfort has developed then you do need oestrogen in some form or another to keep things ok.
As for the HRT. Did your doc know that it wasn't working for you? I think that the 1/5 dosage is the lowest and it could very well be that you need to be on a higher dose to get the full effect. If you look at the green menu at the top of the page you will find all of the different HRT's listed. Six months is normally long enough to know whether one will work for you. Three months is the normal time stated. There is no reason why you can't ask your doc to prescribe Tibolone. Why not make an appointment, have a good research on here, and then go and discuss further options?
Most of us on here can relate to your feelings at some point or another. The menopause stuff comes as a big shock. After all, surely your periods stop, you get a couple of hot flushes and then it's all over with - well that's what I thought!!
Taz x