Endometriosis mystery

Patient: My names hannah and i have been having abnormal painful cramps in my pelvic area. This has been going on since november of 2012. They happen when i have to use the restroom or when i bleed. Intercourse is painful too. I jave had a pelvic ultrasound, a colonoscapy, and an obgyn. They all didnt see anything but the obgyn said that the symptoms sound like endometriosis and suggested a laropscapy to see if they see anything. Could i possibly have endometriosis? Im tired of being in this unbearable pain, i want to know whats wrong.