What causes the dizziness?

Background: Miss Kwok recently experienced dizziness in the past few days, it was not too serious. She didn’t have tinnitus. Blood pressure and blood sugar level were normal. A doctor in general practice said this could be “Meniere’s Disease”.

(1) What causes the dizziness in this case?

(2) What kinds of tests can be done to diagnose this disease?

(3) What treatments are available? (FindDoc Medical information)