Something horrible is happening, and there's nothing you can do to stop it.
Lets back up a little, to the start of this train of thought.
Lets assume something we use to comfort ourselves regularly to be truth: "Nothing is forever."
Now, we normally use this to comfort ourselves, all of the bad things will end eventually.
Now, that means that life will end eventually, ending in Death.
But that also means Death will end eventually, too.
"Okay, this guy is some rebirth fanatic, I'll just sage this thread and move on," but bear with me, the cycle of rebirth must also end eventually, but into what?
"The universe will end, so what?" But then what ever follows will end, too.
"So another universe will pop up, okay?" But then that must end.
"See above." But then that cycle must end.
"You lost me." Thats where I'm going.
Just what happens after this cycle of universes ends? What could possibly come next? And what after that? And after that? We cannot possibly imagine the end of this horrid infinite loop.
Lost in a void of things extremely bad and good at the same time, how will you feel?
The pain seems like it would never end, but according to our assumed truth it must.
Game as life seems, every once in a while you just have to stop and read the first words of the last five lines.