What treatments have you found to be effective for mal de débarquement after trialing benzodiazepines such as clonazepam?  

Try to find an underlying history of migraine. Generally SSRIs and SNRIs (if headache is a feature) can help, but there are no controlled trials for this. Benzodiazepines should be used temporarily as a bridge for the above. If a history of migraine, even remote, is present, sometimes antimigraine m...