Hello Amy,
I am in a very similar situation as you - but I am 47 now and on various types of HRT since 43. So your post and the responses of the very knowlegeable ladies here will be so helpful to me as well.
I am now on a 50 mcg estradiol patch since January, with 200 utrogestan used vaginally for 12 days each month. January and February were okayish but these last months I just get bonkers during and after the utrigestan - the dizziness all day, headaches, lethargy, depression, crying, no libido. I have become convinced in myself that this misery is due to the long days of utro but that I am not necessarily progesterone intolerant. I have done well on dydrogesterone before so my plan for this cycle is to stop the utrogestan and try dydrogesterone for the recommended 14 days in 10 mcg (this is the recommendation if dydro is taken as part of HRT).
I live in Bulgaria so dydrogesterone is available separately. I sooo hope this plan will work as I also tend to have thickened uterus lining and cannot possibly do a shorter or lower prog regime. I go to regular scans (every 3 months) and I also do breast ultrasound checks every 6 months, although I don't have a family history of breast problems.
Have you thought of trying another progestin as ,like me, you may not agree with the utrogestan? Reading from experiences here, not every woman likes it but may do well on some synthetic progestins. I hope you will find a solution soon and please post!
I will also try to update here after I do a course of dydro and whether there is any difference in mood and welbeing. I hope so!
Milamam xxx