Could also be fibroids, I had same thing and ultrsound said fibroids which go away o there own after menopause, great ...
Doesn't sound like pregnancy to me but I would get tested for the endometriosis. I have had pain before but it was not that severe and it was because I had bladder irritation and just drank more water. Yours sounds more serious and should be addressed by a doctor PLEASE.
1st dont be embarras about it can i ask have u done test to c if u have baby if u have pains during sex and feeling sick and pass out sounds like u r
i had the same thing and it ended up being that i had endemetriosis signs of that is pain during sex, heavy bleeding during menstural.