Best wishes your way.
IIRC, my wife suffered from BBPV - or something similar a few years ago in NY. You can imagine the consequences for someone who's job is to sing suspended in the air, head first, spinning and kicking...
Among other things, doctor had put her on a very low sodium diet for a while.
Even if I'm used to being very mindful of my sodium intake and haven't used a salt shaker in over a decade found it incredibly hard to keep up with this diet. But I learned a few recipes I'm still using.
She's had one or two short episodes after that, but nothing as serious as that one time.
I think the one doctor who finally got her rid of it had her do some very simple positioning exercises. Almost seemed too good and too ridiculously simple to be true, but it worked in no time.