I use to have it. I Would have severe cramps 3 weeks out of the month. I had a surgery done to help remove the pain. Also, birth control pills relieved some pain as well as naproxen.
I never had fertility complications though.
Your best bet is to do research.
I was diagnosed with it so many years ago and I never really did anything about it. They prescribed me with naproxen and it didn't help so I gave up! Good luck!