I had the manoeuvre at my docs and she gave me quite severe exercises to do at home, at first I thought she was wrong but after a couple of weeks it started to ease and now thankfully it’s only every now and again where I get a bad head zap as I call it.
Did have the same problem as you, move head to left and it was full blown spin, best to lay on side, turn head to left and let your head stay their till spinning stops, then follow through.
Then exercise by holding onto something and leaning over forward, whichever position causes it, hold till it eases then raise head, do same over and over till it clears.
Twice daily.