Chattygirl, I would not waste any more time trying the 25mcg patches, if you feel that bad and have that level of symptoms, then clearly it is not working. When I tried the 25mcg patches, they were so ineffectual it was not worth using them. 50mcg is not a particularly high dose and many MM members find them to be very good at controlling their symptoms.
You obviously get on with the Mirena coil and have had the polyps removed so I can't really see the problem with carrying on as you were before providing you are checked regularly. In your case, it wasn't broken so don't try to fix it!
I don't understand why doctors keep trying to get women off HRT when the benefits of using it are immeasureable.