It's common unfortunately. And endo is nor easy to diagnose either, but you could ask for antibodies tests to check for autoimmune conditions (ANA and TPO for thyroid antibodies -Hashimoto's thyroiditis also being common wirh PCOS :-()

I was just diagnosed with PCOS so i may not be the best one to answer but i also have been having these exact issues. I was told the nausea was from the pelvic pain? I found this podcast that talks about having both PCOS and Endometriosis. Maybe it can help? Hope you start to feel better soon!

https://open.spotify.com/episode/01NvzQJvLPLpzR...

Ugh! We need more readily accessible medical records!

I did. I got tested by a rheumatologist in 2013, my ANA was positive but he noted I had no autoimmune disorders.
I didn't find out until 2017 that it was caused due to having a high level of thyroid globin antibodies, which was causing a large mass to continue to grow in half of my thyroid. After I had half my thyroid removed my ana went back to normal. Funny how the endocrinologist, I saw before the rheumatologist, assured me he ran every test in the book, but when I was recently looking over my medical files in preparation to file disability, I found out that he did not exactly do as he claimed. The rheumatologist mentioned it in his notes but nothing was ever done with it, and I was unaware of what the notes said and the test.

@ Erin, I'm curious if you've ever been tested for autoimmune antibodies!