Anomalous, almost-superhuman survival can complicate things. Things appear normal, but the one who has survived quite logically declines to accept certain norms.
This can, perhaps, be strong enough a mental reservation that living in one's own country slowly becomes beyond the pale. It might be possible to just head off into the woods, but if one's life is based in the phenomena of culture, this would be another alienation. And if it were to be compelled, i.e., the border were to be closed, this sort of forced rustication would be a second adversity.