Hi Penguin
Sorry to hear about your issues with utrogestan - the devil's weed!
When I stopped HRT suddenly some years ago - I went back on it after 3 months but it was before that when symptoms began creeping back - first the night-time overheating ( like when I first started becoming menopausal) which woke me up so I tossed and turned in bed, and then the sweats and flushes came back. What was worse were symptoms that I didn't have before which included a horrible pelvic-ache, a sort of heaviness ( presumably as everything dropped due to muscle laxity?). Also started to get the hot spotty itchy blotchy hot face - some form of menopausal acne though not acen type spots. All disappeared when I restarted HRT, never to return and I'm now 70....
Of course we all react differently, but in your position I would probably not want to risk the low oestrogen symptoms returning in time for Christmas and there would be no harm for a couple of months, in using 100 mg Utrogestan for day 14 days, instead of 200 mg - you are not going to develop endometrial hyperplasia in that time.
Also if you are still peri-menopausal, depending on when you ovulate, you will still be producing your own progesterone some months, which will help reduce the lining.
I am only suggesting this reduction in licensed dose on the basis that you are peri-menopausal and it's only for 2-3 months to tied you over Christmas until you manage to get the coil fitted hopefully?
All the best with whatever you decide anyway.
Hurdity x