Quick update:

After four days of doing the Epley maneuver and then trying the Semont maneuver for another day (as advised by a physiotherapist), the vertigo seems to have subsided.

I feel relief as my PCP had been pointing towards orthostatic hypotension as the cause which is sometimes a feature of autonomic PN.

Seems like it was BPPV--a benign disorder remedied by physical therapy.

Paul