Mild unsteadiness;gidines.

I have sudden episodes of rotational vertigo noted 4 Months ago.Symptoms first manifested without premonition when was sitting at my home. I contacted with ENT doctor advised me vertin and notropil 800 mg...I taken the medicine for 1month but there was no improvement..I consulted with neurologist..doctor advised me to do MRI...MRI was OK.....after 2months again rotational vertigo occur with vomiting.there was continuous unsteadiness in between these two severe episodes...after second episode I consulted with ENT...doctor advised me to conduct audiological test and VNG... audiological test was OK and as per report bilateral hearing sensitivity is within normal range, However as per VNG test report left ear response 20% weaker and left ear beating response 26% stronger... doctor informed that it can be labyrinthitis...and prescribed stuzeran 25 and renerve plus taking from 1month,however still there is gidiness and mild unsteadiness with minor improvements.. Please advise