It does sound like endo on bowel and ovaries. That's exactly what I had. I had trouble with bowel movements for years, kept getting fobbed off with IBS. Then when I couldn't fall pregnant I was finally sent for tests and then lap. Because my first lap showed severe endo all over ovaries and bowel I had to be sent to specialist and he decided to have the bowel surgeon present too. I'm not trying to scare you, but I got through it all fine, and didn't have to have a colostomy bag fitted (they do have to warn you of the worst case scenario when operating on or near your bowel). But yes the pain you get going to the toilet is not nice at all so I know what you're going through
My left ovary is completely hidden and squashed under the bowel, so I assume the pain is for that reason. Unfortunately for me they couldn't access the ovary as it was too hidden, and they couldn't get to it without possible severe damage to the bowel. But they did get rid of some endo from the bowel and other places. I don't get as much pain now (operation was March), and going to the toilet is easier now
Hopefully the lap will sort you out. Is it your first one? It may be if it's bad inside you have to have another one with bowel surgeon present too.
I find avoiding white breads, pasta, cakes, alcohol etc (all the nice things basically) helps greatly and the pain seems less sharp. Very hard to do. My motto has become - good and healthy all week long, then have a few treats at the weekend but stop again Monday morning. That way You can look forward to a cake, wine or whatever you like the most at the weekend! Endo on bowel sufferers do benefit greatly from an good diet. I also found a gentle senna tablet helped on really bad constipation days.
Good luck and take care!xx