Stilton I've been suffering from vestibular neuronitis for nearly 5 months now. Conditions are slowly getting better but I now find I get really tired around 5pm.
I've been to see 2 ENT docs, a neurologist and an audiological scientist and it seems that the condition is not particularly well understood especially if symptoms persist for over 3 weeks.
Best advice I can give is try and relax as the symptoms are made worse with stress. Easier said than done I know.
I'm also trying to keep fairly active which helps retrain the brain (cycling etc).
Good luck