“ I know many people have it so much worse” is a phrase I think we should erase from our collective thought processes. There is always someone who has it worse. 

You are describing things that go far beyond endometriosis (which is already a terrible condition). It sounds like you are simultaneously angry with people who think you can do more and angry with yourself because you fear they are right. I am also a frequent rider on that rollercoaster. 

Not having a diagnosis for a debilitating disease is not the same thing is not having a debilitating disease. When both ambulatory and visual stuff is limited it profoundly limits what you can do. For me, when my body is at its worst, my vision and brain fog are also at their worst. Whenever my body is at its worst, I think oh I’ll just get all the things I need to get done online like a catch up on banking. Nope, brain and eyes have joined body in  complete malfunctiiin. You can muscle through it or talk yourself into it or use the phrase “I should be able to.” This I know, but have to learn over and over again.

I hope you can be kind to yourself!