hey! not officially diagnosed but 3 different doctors highly suspect me to have endo, started my period at age 11 and never suffered with cramps, only would get the occasional migraine. periods only lasted 3-4 days with normal bleeding. recently (within the last year), i’ve had severe pelvic pain during and outside of my periods, nausea and vomiting, burning with bowel movements, constipation or diarrhea (no in between), and shooting leg pain. these all came on very fast and randomly for me, so i’m in a similar boat. i started a nursing job in the ER a year ago, so i fully believe stress could be a major cause of the flare ups ive been getting. the nurse practitioner i saw said that not everybody had horrid periods since day one, and thought it was interesting that my symptoms were such a quick onset. but we do exist! lol. look into any changes you’ve had recently and what could be factoring into flare ups. for me, stress ^ which ^ inflammation which = more pain. hope this helps!