I think it can just happen somewhat randomly—anything that can dislodge the particles, and there are a bunch of different factors that could make it more likely to happen (everything from age to sinus infections). But it seems when it happens again, it can be more likely to re-occur.

I read a blog post online by a PT (I don’t know that I’d be able to find it again; otherwise I’d send it to you), and she was writing that immediately after it resolves (up to 2 weeks?), she recommends her patients try to stay upright as much as they can and avoid sudden head movements or activities that can dislodge the particles again. Basically, no sudden movements moving your head one way and bouncing up and down (some workouts, roller coasters, flying, shaking your head vigorously) or lying down suddenly.

Also, I read vitamin D and calcium supplementation may help people absorb the dislodged crystals more quickly, especially if either is low, if any of that helps at all.

I hope it gets better!