I would find a new doctor and seek out a specialist. Your quality of life is important. You deserve treatment now, not if/when you want to have kids. Endo is progressive disease, so that could be like 20 years of worsening symptoms before surgery! And "No other medication helps" simply isn't true. There are a variety of things you could do to try to improve your symptoms, including birth control, other medications, and lifestyle changes.

I recommend the book Know Your Endo by Jessica Murnane

I also recommend the podcast In Sixteen Years

This Learning Library also has helpful resources