Hi Cleochic
Sorry to hear about your problems.
There is no such thing as oestrogen intolerance per se - we wouldn't be able to live otherwise. We have evolved to enjoy very high doses of oestrogen both around ovulation and pregnancy, whereas progesterone intolerance is completely different and related to the menstrual cycle especially, and also pregnancy when we produce huge amounts.
However some women are affected by the use of exogenous oestrogen as in HRT, when applied from outside the body - so it is the mode of delivery or the sudden increase that may be responsible for problems and side effects. .
This is notwithstanding the relationship with histamine which is a different but related issue.
Apart from the horse pee oestrogen ( Premarin) all oestrogen used in HRT are estradiol so changing preparation would not change this though the way you absorb it and therefore the time course of peaks and troughs in your system may be different.
Can you say where you are in menopause re cycles etc and how old you are so we can get a full picture?
Hurdity x