I had gone through your query.
It suggests that your husband suffering from the benign paroxysmal positional vertigo
For your kind information -Within the labyrinth of the inner ear
lie collections of calcium crystals known as otoconia or otoliths.
In patients with BPPV, the otoconia are dislodged from their usual position within the utricle and migrate over time into one of the semicircular canals.
If you have any doubt, I will be available for your query.