In 1 Nephi 11:16-17 it says, "And he said unto me: Knowest thou the condescension of God? And I said unto him: I know that he loveth his children; nevertheless, I do not know the meaning of all things."
I have skipped over this verse so many times without taking the time to really dive down deep into it. What Nephi is basically saying is I have no idea what you are talking about, but this is what I do know. There are so many times in life where things come up that scare us. Perhaps it is a doctrinal question that suddenly turns everything you knew upside down. Perhaps it is a question that someone asked you or a story you heard that makes you question doctrine.
Whatever it is, do not let go of what you know. Instead take a step back and go back to what you do know.
This is why I love the example that Nephi shares so much because that is exactly what he does! He says  I have no idea what you are talking about but I do know that he loves all of his children, and I am one of his children so that means he loves me and because of that not knowing everything is okay.
So hold on to those plain and simple truths. The "primary answers" as we like to call them in the church. Hold onto the fact that you are a Child of God. Sometimes that might be the only thing you think you know in trying times but as Jeffry R. Holland says, "Hold the ground you have already won even if that ground is limited."
Hold onto the fact that you are loved and were created by the same being that created the universe. Hold onto the fact that the scriptures are true, and if you can't even do that just hold onto the simple fact that no matter what you are loved and you are never alone.