Carole, I hope you take this the right way and aren't offended - it's meant to be reassuring - but really, you're not in some kind of totally different category of women
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Everyone goes through menopause (if they live long enough). And everyone has a before and after that. Whenever it happens.
When it happens is a bit irrelevant (besides the fact that you get your own hormones for longer) - you will still face similar situations to other women, just later than they have. It doesn't mean their experiences are somehow not relevant to you.
For eg, when you say re Davina and Louise Newson telling people they need estrogen - " I love them both to bits and I’m sure they are very informative for the vast majority of ladies but in a way they have alienated late onsetters as it is never mentioned. "
They don't really mention it, because it's not a problem. You will still need your estrogen, just later than others. Menopause happens at different times for different women. I am 44yo and quite early. There are many women who are 55yo and, in terms of hormones are in a similar place to me - but I don't see the situation as me being in a totally different category.
We all go through the process, just at different times/ages and it's a bit irrelevant what those ages are - the process itself and hormone levels are more important than what age you are.
Lastly, you are not at increased risk of anything due to having estrogen longer. Just like you wouldn't be if you were on HRT either. As someone else says, those questions they ask at breast-screening are really outdated and irrelevant and risk worrying women unnecessarily. I predict they will stop asking that soon. Unless they are doing some huge study or something, but even then they are not differentiating between women on body identical hormone HRT and women on synthetic hormones, so it's not really going to help us much in terms of risk.
And no, the Mirena is not considered HRT without adding in estrogen as well. It would be considered either contraception or management for heavy bleeding. If you wanted, you could easily ask your GP for some estrogel and try a squirt of it a day and just see how you feel and if it helps with the brain fog. You are on the Mirena, so you are covered for progesterone up to 100mcg patch or 4 pumps of estrogel at least, so you have the freedom to experiment with it if you ever wanted. If it doesn't help yet, then stop for now.