 [ Symptoms ] what could cause a very sudden onset of nausea dizziness and feeling off balance no lead in not on any meds thx  it is mostly cleared up about 2 hours later i was driving at onset and when i got out of the car i also had some trouble walking    fine for a few steps and then i would stagger for a couple [ Disease ] your experience could have been caused by literally dozens of conditions some of the possibilities include stroke transient ischemic attack tia vertigo syncope inner ear disturbance medication side effect diabetic event and heart irregularities i suggest that you start off by seeing your family doctor that person knows your medical history best and can begin a basic investigation by way of diagnostic testing additionally the family doctor may refer you to other medical specialists including a cardiologist and neurologist