DizzinessHeadacheAspirinHeadache DisordersTension-Type HeadacheCluster HeadacheVertigoVascular HeadachesMigraine DisordersVestibular DiseasesHeadache Disorders, SecondaryVestibular Function TestsVestibular NeuronitisPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalMeniere DiseaseWhiplash InjuriesNystagmus, PathologicTreatment OutcomeDouble-Blind MethodMigraine without AuraPostural BalanceNystagmus, PhysiologicSensation DisordersAnalgesicsDrug Therapy, CombinationSyncopeTiclopidineThromboxane B2Motion SicknessLabyrinth DiseasesProspective StudiesOtorhinolaryngologic DiseasesNauseaCyclooxygenase InhibitorsDiagnostic Techniques, OtologicalPlatelet AggregationSpinal PunctureMigraine with AuraSalicylatesNeck PainPrevalenceDose-Response Relationship, DrugTime FactorsPlatelet Function TestsLabyrinthine FluidsQuestionnairesHypotension, OrthostaticRisk FactorsBlood Patch, EpiduralFollow-Up StudiesMagnetic Resonance ImagingVomitingCaloric TestsTomography, X-Ray ComputedRetrospective StudiesNeurologyChronic DiseaseTrigeminal Autonomic CephalalgiasDrug Administration ScheduleAccidental FallsVestibule, Labyrinth