All I can say is, that when I took the other HRT regimes, and then the Utrogestan and Estrodot (the latter chosen because they are both bio identical) my hot flushes and night sweats went within days but after 3 months I began to get really bad headaches daily.
As soon as I stopped this time my flushes etc came back within days and headaches went after 13 days - exactly the same with all of them. I have put on weight all through my different HRT's yet diet and daily activity stayed the same.
Since dropping the Estrodot, April 20th (I also keep a symptom diary for Graves and Meno, as symptoms arte very similar, and I started both at the same time - maybe there's a clue there!) I have had no flushes only a slight heat intolerance but that is definately a Graves symptom which means I am now less hypo. I have no headaches although they may appear after a couple more months. I have lost a kilo but until I lose another I wont put it down to the Prog only regime.
One thing I did notice (although it may have been a one off) I took the Utrogestan orally last night and slept better, so maybe I am not after all absorbing enough dermally? I may alternate, I'm so rock and roll sometimes!!

I have a very open mind and I do research things now, especially since being diagnosed with Graves disease.
I do not expect anyone to blindly follow what I am doing. Everyone needs to research as much as possible, but take most you read with a pinch of salt!
I'm afraid I do not agree, though, with the opinion that if prog only HRT was any good we would be prescribed it. If you have any disease or disorder like Graves, that doctors and even specialists really know so little about and treat so illogically you would know why I say that!
Also I have taken out of the equation any benefits(?) that oestrogen may have. Even that, personally, I dont think has been researched properly.
This is the link to the website. The difference with this one is that the lady not only sells the product, she answers questions, in my opinion knowledgeably, on all aspects of progesterone.
http://www.progesteronetherapy.com/menopause.html#axzz2zMYTj2YHIf you look on the top left and click on 'forums' you will get to a list of questions on different subjects (not quite a forum like this)
I will keep you posted

PS I am about 3 years in to meno and still have all my bits, although obviously redundant now!