tailspin

The rapid, uncontrollable descent of an aircraft in a steep spiral.

The loss of the third engine threw the plane into a tailspin.

A severe mental or emotional collapse; emotional breakdown.

Just hours after leaving the institution, she suffered another tailspin.

Any sharp, sustained, often uncontrollable descent or decline.

The present stock tailspin proves bankruptcy is imminent.

But I was reading a statement that either you made or was part of your movie, “An Inconvenient Truth”, and it said we have just 10 years to avert a major catastrophe that could send our entire planet into a tailspin of epic destruction involving extreme weather, floods, droughts, epidemics and killer heat waves beyond anything we have ever experienced.

Of an aircraft: to go into a rapid, uncontrollable descent in a steep spiral.

To go into a sharp, sustained, often uncontrollable descent or decline.