I'm 37 and positive I have endo: horrible cramps, heavy bleeding, exhaustion, never been pregnant, lots of gastro problems, constipation, etc.
I also gained 15 pounds in 2 months and went up two cup sizes with no change in diet or activity level whatsoever.
(Does endo cause weight gain??)
My new gyne said there's an 80% chance it's endo, put me on Lo Loestrin Fe which stopped my period after the first dose, but I had horrible side effects after just a few days.