Epley only works for BPPV caused by a mechanical problem in the inner ear.
The two "P's are the key factor: Paroxysmal Positional.
It is characterised by sudden onset
of short term
vertigo during movement
or change in orientation
of the head
"Unable to walk for three days/drive for a week/put out-of-service for 3 weeks" and always bit unsteady" don't really seem to fit.
If the symptoms fitted, I would expect that your doctor would have tried Epley.
That said, there is no harm in trying it.
I've had BPPV twice (both times after playing around in the water
with lots of duck diving
and rolling) and it took a few Epley repetitions before it suddenly came right.
Benign – it is not life-threatening
Paroxysmal – it comes in sudden, brief spells
Positional – it gets triggered by certain head
positions or movements
Vertigo – a false sense of rotational movement
- See more at: Benign Paroxysmal Positional Vertigo (BPPV) | Vestibular Disorders Association