Have you ever felt horrible to wait?

Sorry if the question is a bit unclear, but I don’t really know how to express it. Well supposed this scenario happens: you have to wait for something or someone. You know there is nothing you can do but wait. Time passes and that sonething or someone still hasn’t come up, but you don’t know what has happened to them. You can’t check out where they are, what is taking them so long, or whether they will come at all.

Have you ever been in this situation? If so, how can you deal with the frustration of not knowing what the future will bring? And if not, what do you think you would do?