progesterone cream solution for high histamine?

I often read in many groups how bioidentical progesterone cream is a solution to Mcas, histamine issues. I have plenty symptoms of low Progesterone and my allergies gets much worse 2 weeks before period. What about you? Did you try this cream? Can it be any cream or is there something i should be careful about, like some additives? For those based in Uk, how do i get prescription, is it available on NHS?