Progesterone is a startlingly beneficial hormone, and almost all of us could do with more than we have.
Progesterone acts on your breasts and uterus, so it’s essential for healthy reproduction and periods. It also acts on your brain, immune system, and detoxification enzymes. Progesterone does a lot more for you than just fertility and easy periods. It soothes, nourishes, energizes, strengthens, and rescues your body in ways you never imagined.
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 
If you came to me for help with irregular periods, I would think very carefully about your thyroid.