Having said that, there is also a school of thought that the only thing needed is
Estradiol and very little progesterone.. to keep the
levels from fluctuating, which is what you are experiencing (in my opinion... I am a teacher, not a doctor, but I have been going through the 'hormone jungle' for some time now).
Take a look at my profile page, particularly the entry, or comment, from this week on my journal page (bioidentical hormones) and try to get some of the books...