Hi and welcome to MM - this does sound a bit of a mystery!!! If you are still peri meno (which you probably are) unfortunately your own hormones will be fluctuating in the background and this could well explain why you find the HRT works for a while and then symptoms return - however, you have tried an increased dose and this has still not been enough??!!! From what you are describing, I would say that your own hormones are fluctuating so this will give the impression that the HRT isn't working.
Why should all these HRTs only work for a couple of months? The hormonal fluctuations is one aspect but if you have been chopping and changing this might also cause more issues - it generally takes at least 3 months for any HRT to do it's magic. They should have checked your oestrogen levels as, when on HRT, this would show whether you are absorbing the HRT properly or not - so, if the oestrogen level was low then this would indicate you are not absorbing the HRT.
I assume the blood test they did was for thyroid function??? If the thyroid is not working properly then can explain flushes etc.
You might want to consider having a Mirena fitted and then have oestrogen alongside as either pills, patch or Oestrogel. The Mirena will protect the womb lining and should eventually stop all bleeding and you can then use as much oestrogen as you need to control flushes. There have been a small number of ladies posting on this site recently reporting that they don't absorb hormones well - so some women clearly do have problems.
Here is the info from this site about the Mirena:
Mirena is a levonorgestrel (type of progestogen) releasing system which sits inside the womb, gradually releasing the progestogen into the womb. It is licensed in the UK and Ireland as a contraceptive agent, for treatment of heavy periods and, from August 2004, also for the progestogen component of HRT. It can be used in both the perimenopause and postmenopause and it is particularly useful for:
Persistent progestogenic side effects from systemic HRT despite changes in type and route of progestogen.
When contraception is required along with HRT in the perimenopause.
When withdrawal bleeds on sequential HRT are heavy, after investigation if indicated. (see WHEN TO BE REFERRED )
With Mirena in place, systemic estrogen alone can be taken as the Mirena provides adequate protection of the womb lining and the estrogen dose and route can be tailored to meet the individual's needs.
Progestogenic absorption throughout the body is minimal so reducing progestogenic side effects. The effect of Mirena on the womb lining can significantly reduce bleeding and when used as part of an HRT regimen, in time, 30 to 60% of women have no bleeding at all. Although Mirena used for contraception is licensed for 5 years, the license for use for the progestogen part of HRT is currently 4 years.
Price: £88.00
All the info on the various HRT options are listed under TREATMENTs at the top of this page. It's worth printing out theses details to discuss with your GP. DG x