My father is suffering from meniere's disease please give me a solution.?

Patient history:
* Initially,he experienced vertigo 25 years ago then treatment .(age 50yrs)
* After that his hearing capacity has been decreasing slowly for past 10years followed by sound in ear and rare vertigo attacks.
* Now his symptoms are dizziness, a roaring sound in ears , one side hearing loss and frequent vertigo attacks followed by vomitings(rare).

We consulted almost all top physicians in Andra pradesh such as Apollo,Yashodha, ........ etc.Both ENT and neurologists. They completely checked him and confirmed it as menieres disease but unable to find solution.

Treatment they given:
Vetibular sedatives such as betahistamines,cinnarizines when ever req.
diuretics
piracetam tab 2 per day
nervigen plus and tab one up alternative days.
Low salt diet.

Side effects he experienced: insomnia, tremor and frequent vertigo.
we consulted them again and again but no use. please now a days he unable to tolerate the vertigo attacks. Please frnds recomend right solution and right physician .....