Hi ifcatsruledtheworld
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I'm not sure what the position is re blood tests and early menopause brought on by low BMI but if you are not having periods, are now at almost the average age of menopause and are having those symptoms - then forget about the FSH tests (I presume these were blood tests not saliva?). I know if you are post-menopausal they should be raised but your symptoms show otherwise. What have the actual levels (from blood tests) been?.
If you have had low oestrogen for all those years you definitely need to keep taking it and ideally at a higher level if you can ie 50 mcg which would give you better bone protection than 25 mcg.
Have you been taking utrogestan on a cycle or continuously? Has it given you a bleed at all? If you are on a low dose of oestrogen and are post-menopausal then you can probably get away with a long cycle.
As an example I am mid 60s, and have been on HRT for coming up to 11 years. For the last 6.5 of these I have been on a long cycle ranging from 6-8 weeks - and for most of this time I have been using a 50 mcg Estradot patch (although a few months ago increased it to 62.5 because I also use testosterone). I take utrogestan vaginally 200 mg x 12 days. My bleed lasts a few days and is nowhere near as heavy as it was when I was fertile and had my natural menstrual cycle. I could probably go a bit longer between prog cycles or have a slightly higher oestrogen dose but at my age I don't want to push my luck re the endometrium!
This has been with the approval of my doctor (the longer cycle) and scans just after the bleed have showed the thickness is fine ( just under 5 mm the last time it was done).
A good rule of thumb is - the higher the oestrogen dose you have, the more progesterone you need for a longer period of time, and the less likely a long cycle is to work. Vaginal progresterone allows more to get to where it is needed than when taken orally.
It is definitley inadvisable to take oestrogen only even if you are very progesterone intolerant.
There are LOTS of posts about this on this website and a while thread devoted to Utrogestan and estrogel where you will find some nuggets of info and experiences from other women
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Hurdity x