a synonym for crisis: disaster.
Disaster
shock
One option is the word disaster.
Disaster
A synonym starting with d of the word calamity is 'disaster'
"Disaster" is probably the closest synonym, but "distress" rather close.
A disaster, like a calamity is a hugely problematic turn of events.
tragedy, disaster, collapse, downfall, cataclysm
disaster
Disaster?
disaster, catastrophe, fiasco