Could be the Urtrogestan.
Now i am a urtrogestan 'hater' I quit after 5 days on it as it drove me absolutley nuts!! Some folk on here absolutley love it though, so this is just my opinion.
Me and progesterone have never really got on, but if you were fine on your other regieme, check what progesterone was in that and see if it comes alone and combo it with your oestrogen
Lots may disagree with me on this, but Oestrogen is pretty much Oestrogen in whatever form. There are some older ones that are not used much these days, but i think nearly all preps are based on estraidol hemihydrate which is newer and in most preps these days.
If you were on the other for 12 yrs then the headache could just be down to the change in regieme, or stress brought on by all the shortages!!
I am on Femeston 1mgs and Oestrogen (whatever the pharmcy has)patches , the dose of which i adjust according to symptom control