not everyone's rocks are loose! We all have calcium carbonate crystals inside our inner ears. They shift forward and back and up and down to help us sense movement and the position of our heads. Sometimes they fall out from where they are supposed to be (Vestibule) and go where they are not supposed to be (Semicircular Canals). This condition is called Benign Paroxysmal Positional Vertigo. Physical Therapy is usually very helpful at correcting the problem if the problem does not correct itself.
It is important to not assume that just because one is dizzy that they have BPPV. There are many other causes of dizziness than BPPV. I think individuals, who have not been diagnosed by their Doctors, hear about BPPV and hope it is the cause of their problem. However, it is very important each individual receive a diagnosis from their Physician or the Emergency Department Physician if they are dizzy and do not know why.