Lightening Crotch

I'm 17 and experiencing severe "lightening crotch" this is normally only pregnant women who get this. I have read that it's also common in girls who have endometriosis or pcos. I have talked to my doctor about both of those things because it's in my family and I have multiple symptoms. So I was wondering if anyone can relate and what you do when this happens!? It's incredibly painful for me I know everyone is different though when it comes to pain. Also I notice it's a lot worse when I am in my period