I went to the ER last weekend, Friday night, and they kept me through midday Sunday. I have another (this would be the 8th I'm aware of in 2 years) kidney stone, but they were more concerned with what turned out to be Diverticulosis. After some research it seems to potentially answer why so many frequent kisney stones from an otherwise healthy kidney.
Apparently other organs throwing a fit (including but not limited to kidneys throwing stones) is actually very common with onset of Diverticulosis.
Also it is unusual but not unheard of in people as young as me. I just turned 34 mid July. I don't know if it's a common comorbid condition with EDS and POTS, but I would be surprised to learn otherwise.
The joy of autoimmune diseases is that they like to trigger each other in a seemingly never ending chain of pain and medical confusion.