It sounds like progesterone intolerance but it is a bit strange that you didn't get these symptoms when you first started it. I wonder if your underlying hormonal situation has changed for example lower ovarian estrogen production.
You could try taking the progesterone vaginally instead - it doesn't convert to psychoactive metabolites that way, reducing the dose is also an option but this really shouldn't be done without endometrial monitoring to ensure it is controlling your endometrium.
Alternatively you could consider a progestin instead such as the mirena IUS or daily desogestrel 150mcg or slynd as your endometrial protection. The latter two are off label but supported by evidence and increasingly used in practice.
Tibolone is another good option for progesterone intolerant women although you would have to say your periods had completely stopped to get this.
Anecdotally, a robust dose of estrogen and the addition of testosterone also make the progesterone easier to tolerate in some patients, although you would have to say it was for low libido on the NHS.
