I do eat a lot of sodium, but here is an interesting anecdote:
A friend's husband had Lyme Disease - and had very bad veritgo from it which was exacerbated by a high sodium intake (I assume the ear works on the sodium potassium pump in some manner?)
but she used to have to make a very careful diet for him so as to remove sodium as much as possible, which would prevent his vertigo.
"Where an inflammatory component is suspected in bilateral Ménière’s disease, short courses of systemic glucocorticoids may be appropriate. It recently has been shown that glucocorticoids not only influence inflammatory process in Ménière’s disease, but also alter fluid dynamics via an interaction with the sodium pumps in the semicircular canals (Ponduglula et al 2004). Intra-tympanic application of corticosteroids appears to have only temporary effects (Dodson 2004) and is probably not recommended"
You might want to experiment with changing your diet, drinking more water, etc.