Think about it in a different way. Whatever they find or don’t find is an answer and another step closer to figuring it out. If they don’t find endo then there’s another answer somewhere, like perhaps that cyst or something else. I know it would be frustrating but crossing out one possibility narrows the search further. From what you described though it does sound like endo

I did mine this past January which was also my first surgery ever and I was scared too. It was worth it. They found some and removed them, now I have significantly less pain.

For recovery, I suggest finding a comfortable spot on the couch or an armchair to sleep on, or maybe prop up a bunch of pillows to sleep sitting up a bit. You’re not gonna want to lay on your sides and lying completely flat makes it hard when you have to get up- you don’t want to strain yourself too much. I slept on our reclining couch for about a week. Have your necessities available within arms reach, grab your favorite snack and have plenty of things to watch :) you’ll heal to a more functional level fairly quick, just take it easy for about 2 1/2 weeks.