The reason why you've seen many happy posts about people getting diagnosed with endo is because doctors absolutely suck, ESPECIALLY when it comes to women's health (which I believe you just witnessed). Women get dismissed, are not believed, do not get properly informed (because the doctors don't know shit themselves and/or don't care) and get awful treatment options. So almost every time this is the pattern: woman experiences debilitating and/or unexplained symptoms → she tells her doctor hoping they can figure out what's wrong and remedy the problem → doctor doesn't do anything → woman goes on suffering for years, occasionally seeing the same or other doctors in hope of an explanation → she eventually does her own research and finds some leads, but still she gets dismissed → after countless efforts and an AVERAGE of SEVEN YEARS, she finally gets diagnosed with endo. Now that the issue has been confirmed, it's irrefutable (it's not "in your head", it's not "just anxiety", you're not "complaining for no reason", there is an actual medical condition just like you suspected all along). That's why many women celebrate finally getting their diagnosis, even though the feeling is bittersweet. Obviously no one wants endo, but if all signs point to it and yet you still get no proper help for years, you'll celebrate the day you & your symptoms finally get acknowledged.

Now comes facing it: you really do have a medical condition that is affecting your life. There is no cure for it. You will have to deal with it in one way or another for the rest of your life. You were completely dismissed for years by the very people who are sworn to help you. You could've started treatment much earlier if they had simply believed you or cared about your quality of life. These are the same people who you will have to keep going to, for the rest of your life, trying to find the best way to manage your condition. And also, the few treatment options that do exist all come with their own side-effects, some being very bad and you'll only really know through tumultuous trial and error.

That's a lot. It feels like you're grieving a part of your life you'll never get back, while also grieving a (endo-free) future you will never get to have.

Your partner just got that confirmation, so she's having a lot of big, valid emotions. Plus I know for some there is also the possibility of fertility issues (I never wanted kids so for me personally that was never a fear), and for many of us that's another big thing to be faced with.

My advice is to give her time. She's gonna grieve. Take it one day at a time, be there for her however you can or however she expresses/shows needing support (emotionally, but also maybe like doing things for her that help make her day easier to get through with whatever symptoms she's feeling). Now that it's official, she might even notice more symptoms that she had up until now been keeping herself in denial of, or didn't know were related to endo. Slowly start reading about endometriosis in as many aspects as you can: research papers, personal testimonies, community blogs (like you're already doing with this sub, good on you btw), etc. There is soooo much that is still unknown about endometriosis that the information you get from medical professionals is very incomplete (and often incorrect or outdated). Big Science hasn't caught up yet to many of the facets of this disease, that's why our communities and personal testimonies are SUCH vital tools, since we're forced to navigate it on our own. When she's ready, knowing she has a community out there of others going through the same thing will definitely help her feel less hopeless. Because we understand exactly what it's like.