When did he first start with the vertigo?
It may be a viral labyrinthitis ( viral infection affecting the inner ear )
It could be inflammation affecting the vestibular nerve
Meniere's disease probably less likely as that may not have such rapid onset usually and tends to be accompanied by ringing in ears and diminished hearing ..
I would advise that he get in to consult ENT specialist for further evaluation...
ANTIVERT is medication that may help reduce severity of vertigo and nausea ...
Valium also may be helpful..
I hope that this information is helpful for you
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Thank you and Best Regards,
Anthony Bray MD