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.
Endometriosis is not like other period problems. It’s not a hormonal condition like PMS and PCOS. It’s affected by hormones, yes, but fundamentally 
PMS is my favorite thing to treat because it responds so well to natural treatment. I love to hear patients say: “I was surprised when my period just arrived. I didn’t even feel it coming.”