Existential Crisis, writ large, plain & simple.
If the unexpected is agreeable, well, you often see it as a "gift" from the Universe. Feelings of joy and good cheer flow thru you. But it's the offensive kind of unexpected that seems to have a more profound and lasting impact.
It can send you down the rabbit-hole of doubt & uncertainty. You get caught up in the Web of Disillusioning. Yikes. What's the way forward? Well, it's Forward. One step at a time. You start a rebuild, a re-think. You re-formulate, and come up with some new dance steps.
Best response? Fuck it. Carry on my Wayward Son. Put on new shoes and Let's dance...