Problems appear bigger than they really are because you are exaggerating.when a problem is all that occupies your mind, it is natural for that problem to grow large enough to occupy all the available mental space.
The mind needs some activities; it needs to be kept constantly busy. If you do not keep the mind engaged. It will make your life miserable. It is not healthy to allow the mind to do whatever it wants. Therefore , keep the mind busy watching the breath come up and down. It will not have time to cause you any trouble.