What it's like to have the machine that keeps you alive die while you're on vacation

I know a lot of people whose lives depend on access to medicine. I know fewer other people whose lives also depend on the machinery and software used to dose that medicine. Insulin pumps, pacemakers, and other crucial, always-on medical equipment are crazy useful but also contain the possibility for insane frustration and resentment. I've been pretty honest over the years that I value having an insulin pump, but that I also hate the manufacturers and designers of every pump I've ever used. If you introduced me to any person who has ever designed an insulin pump I've used, I would probably punch them in the face and cuss them out in front of their children. Every single pump I've used as caused me massive problems - though none as bad as the one I'm about to describe.