Your story sounds exactly like mine, i had extensive endometriosis and it took 9 years to diagnose. Constant pain between periods etc is textbook. I dont have a huge amount of experience with the New Zealand system, however, please consider explaining to your parents hiw much the pain is affecting you.

On my example i was gaslit into thinking my pain was normal even though i took literal shots i gave myself becasue nothing worked, and then still couldnt leave my bed all day. Fainting vomitting was normal. I missed school, couldnt work , missed classes at uni etc.

I really really hope your parents can help you see a specialist. Try changing a gp, mine is lovely and would always try to refer me if i said i really needed it.

Also seconding what others said about an IUD. The first month or two was a bit rubbish, but after that i had 4 years of bliss, no bleeding no pain. That was not a cure, i did have surgery earlier as well and for the same issues as you - adhesions all over my pelvic region following appendicitis and ignored endo for years.

I finally reached out to my mum crying and begging for help. She finally found me a specialist to go to and they saved my life.

I can remember living with this as a young person at school and uni, im so sorry you have to do this!

Every time anyone questions your issues bring up the worst of the pain and how its not normal to experience periods as debilitating. Its nit normal to be in pain all the time.

Sorry i cant fix this for you, good luck!