I’m not an expert on this but according to the pathology, the evidence is that Menieres (endolymphatic hydrops) appears to be caused by the saline ‘pump’ (stria vascularis) into the cochlear duct overproducing the saline or making it too salty and causing osmotic influx to swell this cavity. As this normally flexible structure and which contains the basilar membrane becomes turgid, the ability of the basilar membrane to vibrate, especially at low frequencies becomes impaired. Though the HF seems to still work OK as the salt Ion supply is still good which allows the hair cells to function normally.
The Stria Vascularis itself is like renal tissue (kidney) and performs an osmotic function through graduated capillaries in the transmission of the sodium salt ions over other substances.
So, there’s a few things you might want to consider - medication that specifically affects your renal function/fluid levels especially diuretics, some heart medication, anything designed to either thicken or thin the blood.
The salt balance in your diet can be a major factor - I use the term ‘salt’ loosely here as there are sodium salts, potassium salts etc. Incurring an imbalance between any of these may yield a potential problem as the kidneys are required to do more work.
In addition, it’s been reported that diet, caffeine and other stimulants like alcohol, chocolate and tobacco can cause issues as well. Though I’m not sure about the knock-on chemistry involved in these.
Broadly speaking (though don’t undertake big changes without consulting your doctor) some people have found that relatively small dietary changes have helped - even in some cases reversing some conventional ‘lifestyle’ changes that make conventional dietary sense.
That’s the sum total of my Menieres background - I can’t give you citations for most of it as the cases seem to be very individually subjective as to what works and what doesn’t.