I've never been sick enough to end a paddling trip, but did have one minor health crisis on a backpack trip

First year the Pukaskwa National Park opened in Ontario.
It located on the eastern shore of Superior.
We ( another guy) and me had planned to hike the new trail that skirts the water from North to South.
Nearly half-way thru I woke up in the morning in agonizing pain. Vomiting/ severe abdominal pain, especially in lower back area and fever. We had filtered all water and in those days we ate freeze dried food. We had aspirins but even maximizing the dose didn't help. I laid in camp all day and we discussed my buddy packing light and going back to Native village and getting them to run a boat down to pick me up.
Next morning I got up and felt great

Walked around, ate breakfast, even did some calisthenics. Decided it was a 24 hour thing and headed out. That and the next day everything was fine. Then it happened again, even worse this time. Same symptoms and same down time.
When I recovered we decided to head back as we hadn't reached mid-point and figured picking what we knew was better than going forward.
Made it home to MI, but was feeling poor. I was having trouble urinating by then. Went to doctor and it turned out I was passing a kidney stone

The doctor said he thought it was thru the kidney ducts and working it's way out. That was a Friday. Come Sunday morning and I'm straining to urinate when all of a sudden I "break free" and hear something clicking off the side of the commode

There in the bottom, lay a kidney stone the size of a navy bean

I retrieved it and brought it back to doctor for my check-up.
He said it was a pretty big one and that passing a kidney stone is as close to experiencing the pain of childbirth as a man could get.
I don't know about that, but if it's even close to being true, I understand why birthing mothers want/need those drugs