Thanks for posting in HealthCareMagic.
As your your neighbour is experiencing vertigo, dizziness
and vomiting which can be due to hearing implants. However, Labyrinthitis
, an infection of inner ear
also presents similarly.
aprochlorperazine is a anti psychotic drug can be used for vomiting. It may occasionally cause side effects like other drugs so it is not an excuse to not to take it.
If symtoms do not resolve or experience any side effect then visit ENT specialist
Hopr it helps.