If your dr really suspects endo, the only way to diagnose it is with a laparoscopy. It doesn't always show up on an ultrasound. I had a mass on my ultrasound that they couldn't tell what it was, and since they suspected endo, I had the lap. The mass ended up being a simple cyst, but they found extensive endo which was not seen on my ultrasound. I have both endo and IBS. I had hoped that after my lap and removal of the endo (well, at least some of it anyway), that the IBS would get better, but there hasn't been a great improvement; now I have a tendency to a little more C and maybe a little less pain, but still lots of G and bloating - ugggghhh. All of these tests and procedures are so nerve wracking and only make our IBS act up even more from all the stress. Good luck Nat.