Hi, and welcome!
First, don't worry about TMI here. We're all in the same boat, and we've seen and heard so much worse than what you've actually said, haha!
So, yes, Crohn's can affect all linings of the bowel, but I do think they'd be able to tell a difference between the endometriosis and the Crohn's, especially based on location. Endometriosis scar tissue will radiate away from a different place than Crohn's scar tissue would (if it is even on the outside).
I am really surprised they aren't doing a colonoscopy first, as opposed to a laproscopy. That seems a bit extreme if they can't decide if it's one or the other. Have they done any blood work at all? You can't diagnose Crohn's with labwork, but you can get an idea if a few levels are elevated. If they aren't elevated, that doesn't mean negative. But it's a much easier indicator!
It is VERY common to have a mixture of formed stool vs. diarrhea. I think that the diarrhea hurts worse because it is moving much more quickly through the bowel. It also will bring some acid along with it, I imagine.
Bloating is extremely common as well. :)
I have had a sigmoidoscopy a while back but that was before all of my pain and symptoms started, I kind of feel like they are reluctant to do another scope because I have had one before, which is very stupid I know! but I am going to push for a one either that or go private (instead of the NHS as I live in the UK). I have also heard things and read in the news in the UK that the NHS medical staff are saying no to scans and diagnostic procedures due to cuts in the money they recieve, so this may be another reason why they are doing this.
Personally I would of thought that a laparoscopy would cost alot more than a colonoscopy!
My blood work shows I am slightly anemic and that was it but they only done a full blood count and nothing else. I have also lost 3 stone in around 10 months which is loads for me! I have very very high calprotectin levels of 1000> when they are meant to be <60 acording to my GP.
I really appriciate your reply thank you!