Stilton, I can only say that I too am still having the symptoms of this condition. Mine started in March and has been diagnosed as Vestibular Neuronitis in the right ear.
I have been able to return to work because I am in Ops and not flying, but everyday life is a big struggle. It must be pretty rough having to give up flying for so long.
Not sure if I can offer any insights into this though! I have been doing the vestibular rehab exercises for over 5 months and my balance has not improved much. I have been told to try and force the vestibular system to retune itself by not using other senses for balance. This means balancing on foam with eyes closed and this sort of thing. Not sure how long compensation will take.