I have suffered from random pain in my lower left pelvis. It feels like something ripping inside of me. It can start of dull and get worse throughout the day. Some times it has gotten so bad that I have had to get an ambulance out because I can't move from the pain. I went to A&E last night who just told me I had IBS and need to take buscopan. I have been referred for colonoscopy and an ultrasound but none of these will show if I have endometriosis. I am on the implant in my arm for contraception so I do not have regular periods. Has anyone got any advice or tips. Could I have endometriosis or could it just be IBS.