Endometriosis:( plz help

Hi everyone. I have one daughter she is 3 years old. We r ttc our second baby 6 months with no luck. I always had painful periods bit doctors told me after i give a birth they will go. But no they didnt. Well painful periods now fine for me i can live with them but now im getting menstrual cramps 12 days before my period. So i decided to visit doctor she told me that she thinks it could be endometriosis. Im in shock. So she ordered ultrasound. Which ie at the end of the month. Plz ladies who went true that plz tell me what should i do. As u know doctors waisting our time. I Don't want to waste my time i want to conceive. How doctors can put diagnosis for endometriosis? And what should i do? Plz help me