"Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light, and the stars will fall from heaven,
and the powers of the heavens will be shaken; then will appear the sign of the Son of man in heaven, and then all the tribes of the earth will mourn, and they will see the Son of man coming on the clouds of heaven with power and great glory; and he will send out his angels with a loud trumpet call, and they will gather his elect from the four winds, from one end of heaven to the other." -
Mt 24:29-31
"Before Christ's second coming the Church must pass through a final trial
that will shake the faith of many believers. The persecution that accompanies her pilgrimage on earth will unveil the 'mystery of iniquity' in the form of a religious deception offering men an apparent solution to their problems at the price of apostasy from the truth. The supreme religious deception is that of the Antichrist, a pseudo-messianism by which man glorifies himself in place of God and of his Messiah come in the flesh." -
Catechism of the Catholic Church, 675
“
Unlike former days, the denial of God or of religion, or the abandonment of them, are no longer unusual and individual occurrences. For today it is not rare for such things to be presented as requirements of scientific progress or of a certain new humanism. In numerous places these views are voiced not only in the teachings of philosophers, but on every side they influence literature, the arts, the interpretation of the humanities and of history and civil laws themselves.
As a consequence, many people are shaken.” -
Gaudium et Spes, Vatican II
"When he opened the sixth seal, I looked, and behold, there was a great earthquake; and the sun became black as sackcloth,
the full moon became like blood,[1]
and the stars of the sky fell to the earth as the fig tree sheds its winter fruit when shaken by a gale;[2] the sky vanished like a scroll that is rolled up, and every mountain and island was removed from its place." -
Rv 6:12-14
[1] Blood Moon (Sep 27/28, 2015)
[2] Vatican responds to CDF official’s 'coming out' (Oct 3, 2015)
Excerpts from
St. Bede's commentary:
"
sun. This is, as if the power of Christ were hidden, or His doctrine temporarily obscured, or covered by a veil, when the servants of Antichrist are brought to attack the servants of Christ."
"
heaven. As a scroll rolled up contains indeed mysteries within, while there is no appearance of them without, so will it be with the Church. At that time, known only to her own, she will prudently avoid persecution in retirement, that by such concealment she may remain unperceived by those without."
"
mountain. He speaks of the members of the Church, as differing according to the character of their offices or powers, and foretells, that no one will be without his share in this whirlwind. But the movement caused by it will be dissimilar, for in the good it will be one of precaution by flight, but in the bad, of giving way by compliance."
Perhaps this won't ease your worries, but take comfort in knowing that the Church will be victorious when Jesus returns.