Hi op, I'm sorry you're in this boat. I was in a similar position a few years ago. We TTC for almost 10 years. I also have endo.
It didn't turn out with the ending we wanted, we've accepted being childless, but it's a hard road to go down and you really do have my heart . See if you can get the endo lasered. Might give more chance.
If adoption is something you think might be the way for you to become a parent, start exploring the process now. We went to some initial information sessions but it wasn't for us.
What I can tell you, is that although it seems bleak at the moment, and if you don't end up having the baby you wish for, there is life for you out the other side of the hurt. Accepting childlessness was a grieving process for us. And there will always be moments of sadness, but now we've gone through that process, you know what, life's still good! We have disposable income to do what we like and once your friends with kids get through the toddler years, they'll be itching for child free meet ups with you!
I hope you do have a child op, I just wanted to reassure that if it doesn't happen, it's ok. 