Dotty I've just gone through exactly the same thing. I've had sort of success (sort of - it's never ever perfect is it
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In my case, after hysteroscopy, polypectomy, biopsy and d&c, I had a mirena fitted whilst I was under general getting all the other stuff done. That was back in November. The bleeding went away - for three months everything was lovely until there we go, a smear of blood on toilet paper when wiping which I thought was piles!
Doctor confirmed bleeding in the uterus, scan confirmed ANOTHER blimmin polyp at 8mm. The cancer specialist looked at the scan pics and the hysteroscopy pics and decided that it was so unlikely to be anything bad after all the checking I've had that they're going to monitor it with another scan in 3 months.
The thing is, the coil is keeping that bleed to a minimum - it's barely noticeable, and is not troubling me the way it was before the coil fitted. I've been told it's because the coil is trying to keep it in check. The reason (they think) that it's not quite strong enough is because my patch is 125 which is quite high (I don't absorb, my oestrogen reading was quite low on last check) so they think I may need to reduce it.
They've also just prescribed provera to take alongside the coil which I'm not keen to do - but this all backs up what Nas and CLKD suggested early in the thread. If the progesterone can't quite manage on it's own, you may get thickening.
I'm actually at the point of giving up on HRT to be honest. Nothing I do seems to get that oestrogen level up, and it just sets off the polyps the higher I go. I've got mirtazapine to get me through the insomnia and palpitations which were my main symptoms. Arseing around with scans and constant trips to the doc to check on bleeds, however minor, is just too stressful.
For you, however, a coil may be the magic solution.