Very unlikely LW44 - oestrogen is the hormone that makes us feel alive, energised, well and good, in physiological doses. However replacing it with tablet HRT may well cause side effects due to metabolic by products ( ie from it being broken down through liver etc)
If you are still feeling anxious and you are peri it could be to do with hormonal fluctuations and especially from low oestrogen, or the norethisterone has not cleared your system yet. Also it can take more than a few days for the body to acclimatise to different hormone levels - there are some almost immediate effects but also longer term ones.
I would go for transdermal oestrogen if possible - after discussion with your consultant - but Evorel contains norethisterone so that's out of the question. Of the combi patches there is Femseven, or you could try separate oestrogen (patch of gel) and progesterone (utrogestan) or a synthetic one eg Provera if you could tolerate it.
Hurdity x