Since your playlist is kinda vague, I'll throw in a few tunes that sound apocalyptic rather than being explicitly about it. Perhaps you'll like them regardless of the content.
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Cyclotimia's ‘Same Place’ and maybe ‘Leviathan’
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cEvin Key: ‘Beauty Is the Enemy’ (kinda NSFL video, although it's evidently faked)
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maybe Laibach's ‘Als Geist’
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György Ligeti: ‘Lux Aeterna’ and other compositions
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Dead Can Dance: ‘The Host of Seraphim’
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Philip Glass: ‘Pruit Igoe’
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Julee Cruise: e.g. ‘Into the Night’
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Mazzy Star: ‘Mary Of Silence’