In modern times perhaps we could connect with this type of fear with a more modern fear of ruthlessness that could take your life. That is the issue of organ harnessing. In some parts of the world people especially young men are seduced, drugged and then may wake up in a bathtub of ice. Having one or both kidneys harvested for profit. In Abraham's time losing a wife may have been akin to losing a kidney.
Organ harvesting is a growing threat. Even quasi legitimate business' are into making profit off the organs of aborted children i.e. Planned Parenthood. The fear is real.
So we must act wisely to threats just as Abraham did. One; make sure you and your friends and family are aware of the organ trafficking threat and two; avoid buying from companies that support abortion or organ harvesting.
Brothers and sisters: We hold this treasure in earthen vessels, that the surpassing power may be of God and not from us. We are afflicted in every way, but not constrained; perplexed, but not driven to despair; persecuted, but not abandoned; struck down, but not destroyed; always carrying about in the body the dying of Jesus, so that the life of Jesus may also be manifested in our body. For we who live are constantly being given up to death for the sake of Jesus, so that the life of Jesus may be manifested in our mortal flesh. (2 Corinthians 4:7-10)