Headaches, anxiety, insomnia, brain fog, hives, and nasal congestion. These are just a few of the symptoms of mast cell activation or high histamine.
Histamine symptoms are more common in women and often track with the menstrual cycle, occurring when estrogen is high at ovulation and about a week before the period.

Progesterone is a startlingly beneficial hormone, and almost all of us could do with more than we have.