I had this last year and was signed off work for a week as the doctors originally thought it was caused by a restriction in my neck and I couldn't walk without holding onto walls let alone drive to work.
Trip to the chiropractor and 1 week later - no neck problem - they decided it was a "cold in the inner ear" - how they describe Labarynthitis to the lay person.
Had to go on a 3 week course of pills which they also use to treat the likes of schizophrenia (?*!).
After being told that if it went on for 6 weeks I'd be in the hands of the ENT clinic - thankfully I recovered.
Also thankfully - I hadn't discovered the joys of flying at that point - so didn't have to ground myself.
I don't EVER want a repeat of it!!!!!!!!!!