10-12 days of progesterone is the recommend dose for most progesterones but, if under a private gynae and getting regular scans, a lesser dose can be tried. I still think you are reacting to this particularly progesterone. Do try Provera or Utrogestan as I suggested in my previous post.
I am loath to give this advice about how to use progesterone but as you have only been using one pump of Oetrogel until recently, 10 days of the progesterone may be enough this month and you will then get a bleed to shed the womb lining. When I did one pump of Oestrogel daily and used the progesterone (Dydrogesterone) sequentially to shed the womb, I only ever had 10 days of this progesterone - I did this regime for several years. Try to see your gynae early in January to change the progesterone. I certainly wouldn't do a continuous regime (which means taking progesterone all the time or most of the month). By using a sequi HRT regime, you can tell whether the progesterone suits you or not but for some there will always be compromises with any progesterone. DG x