Vertigo problem, very severe, suddenly within past 10 months, causing cold sweats, vomiting, and uncontrollable room spinning for at least 7 hours per episode? MRI revealed nothing suspicious. Days Prior to vertigo episodes I feel fullness in right ear, sometimes a roaring sound and a bit of unsteadiness . I have meclizine and diazepam but they do not stop the episode , just sleep. Any ideas?