Wow I also had BPPV several years ago and spent several miserable days certain I was dying with a brain tumor or some other horrible neurological condition.
Then I did some research, watched some youtube videos like this one which nicely explains the condition and demonstrates the Epley Maneuver used to treat it. I was able to cure myself instantly and have had no issues since.
Consider this a PSA and @Yuv I sure hope your condition is able to be resolved. Good luck.