I have had those moments on each of my three Caminos. The first WTF moment, in 2013, was shortly after I almost fell off Alto de Perdon on the first day out of Pamplona, along the final several hundred meters before the summit where there is a very steep drop-off.
I literally almost died there and then when two, local mountain bikers on a downhill lark zoomed by and forced me to react, incorrectly as it turned out. My walking companion jumped left, into the shrubbery. I dove off the path to the right, as I had been trained to do whilst serving in the military many years ago. Unfortunately, there was no there "there." One year later, in 2014, I noted that there is now a cable mounted on vertical steel posts to prevent such an occurrence...go figure! One wonders if someone actually did fall off the mountain...
The second WTF, also in 2013, was when I was having expedient surgery on almost infected thick callouses on both of my feet in Burgos. That slowed me down, causing a three day pause for healing in Burgos, but did not deter me.
The third WTF was in 2014 when I fell over a fence, on my head, knocked myself out briefly, and bled from a head wound like a stuck pig, just after Sahagun. Mr.
Brierley's guidebook led me astray. It contains incorrect information in part. So, while cutting across land to rejoin the intended path, I had to hop a wire motorway fence. Note to self, NEVER hop a fence whilst carrying a loaded rucksack. This slowed me down, but as it was my head, and I regained consciousness almost immediately, I rinsed with bottled water, applied a pressure bandage (packet of tissues held in place by a Buff), and pressed onward. When I had a Face Time session with the wife that evening from my hostal, she was furious. I told her it was only my head so to relax...I also had to mend a nasty tear in the crotch of my hiking trousers...bless duck tape! Nothing critical broken and only my pride wounded.
Finally, in 2015, unrecognized dehydration cause me to pass out suddenly three times while walking the 10 days from Porto to Sanitago...a really big WTF after the third "dirt-nap" episode in five-days. I reported this home only when I arrived at Santiago. I may be many things, but stupid is not among them.
My wife was furious at me. But, I called my doctor in the US and made an appointment for the day after I returned home. The doctor feared either a stroke or other heart condition. A full cardiac diagnostic series of tests revealed quite the opposite, no cardiovascular problems whatsoever...go figure! So, I was pronounced "stupid" for not paying closer attention and drinking more liquids. What does not kill us makes us stronger, and smarter, right?
After all this, I sometimes get the impression I am tempting karma or fate... But, I keep returning to do Camino again.
My point is that most of us have at least one, what have I gotten myself into (or WTF) moments on Camino. However, the thing that sorts the tourists from the pilgrims, is how we react to those misfortunes or challenges. A pilgrim perseveres...a tourist makes other travel arrangements...
I hope this helps...