Ruptured appendix at age 8. I was incredibly septic, and during the emergency surgery, they pulled a liter of pus from my insides. The surgery itself was super invasive, and caused internal scarring. Imagine blowing a bubble with bubble gum and popping it inside your guts. The scar tissue makes everything stick together, and has been the cause of chronic pain.
Unfortunately, the fix for the scar tissue is surgery, which will undoubtedly cause more scar tissue.
This adhesion (scar) tissue has fused several of my organs together, caused bunching in my intestines, and done a number on my bladder. They believe that my bladder is stuck to my bowels, so when the bowels are doing their wiggly job, my bladder gets squeezed. Over time, my bladder has gotten weaker, and there are less painful spasms, and more big leaks.
My bladder has never been the strongest, but I feel like it has been giving up more and more over the past few years.
I also dealt with secondary bedwetting in my youth following an assault due to PTSD.