It seems to me that contemplating encountering God (as understood by most Christians), and one's life in Heaven, in the afterlife, could, in some cases, give rise to significant fear.
One might be, after all, in the direct presence of the creator of the universe, the sole almighty being, and one who knows every single thing about you; there is no apt analogue like that in earthly experience and just the unfathomable magnitude of that might be terrifying to consider. (And yes, even given the explicit belief that God is good).
Likewise, the thought of oneself in Heaven (leaving aside considerations of a New Earth), could be, if not exactly fearful, at very least difficult to consider given the, again, boundless degree of difference from our mortal life. The thought that our mortal life and all that went with it is irretrievably over might trouble us. Concerns about how human relationships (arguably the central aspect of human life), such as marriages and camaraderie, would work in Heaven might give us at least concerns--and in some cases deep sadness. There is the notion of identity, which in life is an amalgam of profession, family, interests, values, character, foibles, quirks, history, age, health, traumas, and other factors, and which, in Heaven, might be significantly altered, since many of the important factors will be obviated. And, of course, all physical considerations may be massively altered in a spiritual realm. Taken as a whole, and given that the saved are inevitably headed for just this place, these considerations might generate trepidation in addition to the "meeting God" fear.
To put it shortly: it's a very different being in a very different place--and that might be scary.
So, how, if at all, has Christianity, through authors, notable church leaders, or other key figures, addressed these types of concerns in the primary traditions, such as Catholicism or mainline Protestantism?
[Terminology associated with this gist, if it exists, would also be helpful. And note: I am not at all looking for SE user reassurance or Bible guarantees that the afterlife will not be frightful; I am looking for whether this theme has been addressed in the main traditions or not, and, if so, where and how.]