Yes, I can imagine the stress. The doctor told my family that if we opted to shut down all machines and take the breathing tube out, my father would pass within minutes. That didn't happen. He gasped for air for over an hour and it was horrible to watch this take place. My father fought like h@ll to live, but eventually his lung function couldn't be maintained and he finally passed.
I don't envy anyone that has to make the decision to end life support for a loved one. In some cases, it's not an easy thing to watch.