I've been having all the symptoms of endometriosis for the last 4/5 years. Excruciating pain, as if a knife is twisting my insides and trying to pull it out, nearly passing out from the pain, heavy bleeding etc. I've been numerous times to the hospital and eventually had a laparoscopy which came back fine. Can a lap get it wrong? I really feel there is no other explanation for the pain I have and I've had various ultrasounds etc to check for anything else. The only thing they show up is every now and again there a cysts. Can the lap be wrong?