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First thing is the doctor check to see if you have a sinus or ear infection then rules out any growths like tumors by MRI or CT Scans.
Next the doctor will ask for a medical history because other illnesses could cause some of the same Meniere's symptoms. Vertigo could be cause many other issues.
Then a Ear auto test will be given to see how your hear has been affected & how much you have lost. Your asked if you hear any ringing & for how long. Mine is 24/7 but has I feel an attack coming it gets louder.
Another question is, does vertigo only happen when you move your head a certain way? You could have a simple issue of crystals in the inner ear that are loose. Does your vertigo get triggered by eye movement?
After factoring all these things that's how I was diagnosed. The more you can talk with your doctor the better. Meniere's is not like a physical disease like cancer. I didn't a lot of research then talked with my doctor. Sometimes we get so focus on one issues that we tend to not look at others. I found out my airborne allergies are problem & the doctor did mean there are studies linking allergies & Meniere's? If you find the doctor is not open to suggestion then get a new one. I when 4 doctors before I got the right treatment.