Ne, ty krystaly jsou "neviditelne".

It is thought that BPPV is caused by one or more tiny solid fragments (otoconia) that float about in the fluid of the labyrinth. The fragments are made up of calcium carbonate crystals which are thought to have broken off from the inside lining of the vestibule part of the labyrinth. These cause no problems if the fragment remains in the vestibule. However, problems occur if a fragment gets into one of the semicircular canals.

What is the treatment for benign paroxysmal positional vertigo (BPPV)?
The Epley manoeuvre (na to linku)

Brandt-Daroff exercises

Ale pro jistotu bych sla k doktorovi, aby vyloucil cokoli jineho. Ja nesla, protoze jsem byla sama doma a tady zachranky nejezdej, preslo to samo. Po druhem "zachvatu" ale dcera zaridila ruzne testy, aby se vyloucily jine nemoci. Nenasli teda nic, tohle jsem si vygooglila posleze sama (doktorce na usnim se nelibil muj navrh...), ale sama nic nenasla.