It is quite difficult to describe. It is, I would say, in the category of the Ineffable ; perhaps, and perhaps only, because it has not been sufficiently studied. I am a sturdy believer in God. In spite of This, believers are more prone than others to undergo profound, and even cataclysmic bouts of unbelief. Faith, of course, always wins out - in the end. But will you endure the test ? Blaise Pascal, a great physicist, and inventor
of the calculator in the 17th Century ( if I'm not mistaken ) in his book of recollections " Pensees " ( Thoughts ) writes this : ' Man is the only ever-moving creature which craves intensely for a place where he can halt and say - this place is mine. Yet, when he seems to have found the spot, and tranquil sit back to relax...the ground opens up beneath him and he is thrown irremmisibly into the void. ' Pascal left Mathematics for religion - or better said, spirituality - and was, by Nature one of the Great Mystics.
I myself am about to turn 65, my health is better than what could be expected ( physical and mental )
though the course of life has subjected both to the relentless breaking of huge waves on rock within a quite treacherous harbor. I, like St. Paul, have enjoyed having everything, and also been exposed to having nearly nothing of things we consider basic to life.
Yet I now know in my flesh, the partial end of my existence - my physical death - is not that very very far off. At best 25 years ? Al ready some of my faculties are wearing slowly off. Memory, eyesight, sexual power, possessions, true and meaningful relationships I now have to contemplate in a much wiser way, and they're non too easy to find. The main things - or Values - that gave meaning to my life..i.e.: the quests for Justice, Freedom, Equality ( that is, the Main Courses that give our lives direction ) haven't truly and really changed much for the better since I was a teen.
I will share a comparison : each REAL courageous man who's ever lived will tell you - Courage is not the absence of fear, that would be temerity ( a fool's choice ), true courage is to not be paralyzed by the obvious need to fear, and act in spite of it resolutely and effectively.
So, though I believe in God, from whom I came, and to Whom I'll return after my demise, I do fear death ;
do fear the cancellations of my natural, God-given strengths, virtues and potencies.
And I do believe this is why, when the sun goes down ( more or less ) I have bouts not only with existential angst, but also with existential dread.
My solutions ? Simple. They follow what's been taught. Pray. Pray. Pray. Understand your situation. The Oracle at Delphi said to Socrates, " Know Yourself " That way out of ignorance is also the one fabulous cure. Seek to know what you are going through. Understand it. Pray some more. And stay the course. Like when we're teens - I am a boomer, and was a flower-child, a hippie...we thought we were on the verge of returning to Paradise. But then, the walls came tumbling down around us, and even then, for us romantics, the romantic music changed, now saying : " I beg your pardon, I never promised you a rose garden..." So, conclusion - existential angst IS and exists...and it will most likely hit you like a ton of bricks at a given moment...and Yet, Yes, yet...you can and should get the upper hand of it. It is going tobe one of your very last trials and tribulations.