fiftygirl, sorry if I was confusing but I meant micronised Utrogestan capsules (used vaginally) for the progesterone part of your HRT and Oestrogel to replace the patches you are currently using. I suggested the Oestrogel because I think it works far better than the patches and you mentioned that you have worked your way up to the 100mcg patches which is exactly what I did when I couldn't get enough oestrogen out of them.
Why not ring your doctor back and ask for Oestrogel and Utrogestan? I have had two Mirena coils and would not recommend them for someone who does not have problematic bleeding because it does have side effects. In theory, the progesterone in the Mirena is supposed to mostly stay in the womb but I found that enough of it got into my system to cause breast pain, low mood, low libido and (latterly) migraines. I would not have thought a Mirena would be suitable for someone who has had an ablation anyway. You should be able to take a 100mg Utrogestan capsule vaginally for 7 days each month without getting a bleed.