I think you could also add Heidegger and his beings as forms of Being to the mix. Also, the "tremendous unknown" you speak about would translate in Hindu parlance to Maya, that is, the world of phenomena as it appears. And Hindu philosophy, indeed, posits that Maya is inscrutable, an insight that predates even Nāgārjuna by, at least, two millennia.

However, we are not in the dark as to what we are dealing with, because existence (Being) and consciousness (knowledge) are undeniable and self-evident (even though written out like this they are too reduced to concepts).

Furthermore, they are not limited to human beings, hence, inhuman nature of absolute reality does not distress anyone who can "see past the emptiness", so to speak. It's not about training yourself not to be distressed by the "mismatch," but about accepting who you are, that is, what's that which the concept of "I am" points at. The horror, then, comes from denial and refusal to let go of forms/concepts in terms of one's identity.

Of course, human is not at fault that he intuitively perceives the world in a human way. Although, blaming world for one's distress about its nature while acknowledging its interdependence makes no sense (you are still carving out human out of the interdependent soup of phenomenal world) .

And finally, form-dependent perception allows for (most probably) infinite number of experiences. What could be a better pastime, if you are infinite consciousness and there's nothing but you?