Hope you're ok, I've had exactly the same diagnosis and I know it's a shock. I had as far as I know one nodule that needed removed. I had paid privately for my third surgery which I thought would be routine get rid of the endo, they discovered that the bowel had been infiltrated (nodule) so had to close me up (expensive mistake to go private!!) - surgery involving the bowel is multidisciplinary (gynae/gastro) and you need to be in a nhs hospital with icu etc just in case as it's more serious than regular endo surgery.
In saying all that it sounds like you have an amazing doctor and I'm so glad you're getting good treatment.
I'm surprised they didn't see the nodules on the mri - I had to have one done before they could do 4th surgery. Maybe ask the doc about that. With my adenomyosis, I have
an adendomyoma in the wall of my womb that can be palpated vaginally and can also be described (I think) as a nodule. So I wonder could he mean this? You're entitled to see your hospital notes and can even ask for a copy of any letters sent to your gp from the consultant re. diagnosis at the reception of your gp practice.
I freaked out massively when I found out about the bowel being involved. However the nodules may only have gone a few millimetres so having bowel endo can just mean a tricky excision surgery. I spent months worrying about ending up with a colostomy, but the risk is very small and even if it does happen it's usually temporary while things recover. For me I was on prostap for a while to try and shrink all growths before my surgery. It was still done laparoscopically and felt pretty much the same as after other endo surgery, I was just on higher pain meds and took me a few more weeks to recover properly.
My best advice is don't freak out, trust your doctor and remember they only have to tell you the risks to cover themselves. I know it's horrible, but try to relax and just concentrate on the fact that they know what's wrong and it can be treated which is way more positive than being stuck on morphine!
Re. Hysterectomy as mentioned above, they have said that is probably going to be the outcome for me as well, however hubby and I are currently trying for a family - I'm coping on paracetamol!! (even with needing adeno surgery so it can be done) Starting acupuncture soon too. If you have any questions or just need a chat msg away.
Best of luck xxx