That's also a very good question, because everybody feels pain differently. Depending on where the endometriosis occurs, if it affects the nerves; then it can cause different pain as well.
What I can say is that, when somebody doesn't respond to anti-inflammatories such as Advil plus Tylenol, the first line is birth control. With both of those, if they continue to have debilitating pain, that is when they need to be investigated further with imaging and see a specialist.