This is I think, a fairly common experience for many people at some time or another in their lives. A philosopher would call it 'alienation'. A neuroscientist would call it 'cognitive dissonance'. - when what you experience in everyday life clashes with what you believe or know to be true.
The parallel is with sea sickness. The experienced feeling is due to a mismatch of info being supplied by the inner ears and eyes to the brain. The brain cannot reconcile what its being told by the two separate senses and freaks out. In the case of seasickness, the answer is to shut down one of the senses - either by lying down and keeping the eyes firmly shut, or by shutting down the inner ear with meds.
In the case of 'strange times', alienation, or cognitive dissonance, the answer is to shut down the brain, temporarily. Disconnect from whatever subject is causing the dissonance, in this case your vision of the future caused by PO - refocus on the everyday, go on a Catholic or Budhist retreat, or similar. Take up meditation or knitting
....Go back to ranch in Crawford and cut brush!
Somehow you've just got to stop thinking about it for a while and give the mind a chance to heal itself.