Inclusion Criteria:  New episode of acute vertigo/dizziness/imbalance occuring during the 7 last days Must be able to consent.  Exclusion Criteria:  No traumatic context before symptoms onset No intoxication context Glycemia ≤ 3,0 mmol/L Only one participation is permitted Not able to speak fluently in French or English. Reachable for 3 month follow-up