Hi. Thanks for your query. Noted the history and understood your concerns. Prediabetic stage too can have mild complications and go for OGTT that is oral glucose tolerance test. The bout of dizziness followed by burping that relieves the dizziness can be due to the following reasons: The burping or nausea, vomiting can be a reflex phenomenon that occur in response to the body s understanding that something is not alright. Dizziness can have many reasons, peripheral like unstable heart problems, electrolyte imbalances and so on. The central problems can be related to the vestibulocochlear region or cerebellum that is part of the hind-brain. This can be diagnosed by the following: Consult an ENT Surgeon for clinical evaluation, examination and investigations as advised. You can also get a reference for a neurologist for the same. Treatment with Cinnarazine can helps but must be taken round the clock to be effective. Cetirizine has no role as such to play. Supportive treatment and psychoanalysis with psychotherapy may help in some cases where a proper cause is not found or is not available. You also have to see that you do not go alone as the dizziness can cause problems. Since CT scan brain is showing only mucosal thickening of the sinuses means brain is normal, celebellum is normal. Specific combo study that is MRI and CT of the mastoids to study the semicircular canals and other ear structures can help as well as Angiography of the arteries in the neck like Carotids and Vertebral arteries, of the brain can help establish the diagnosis. Also needed is to rule out any cervical spondilitis and such problems that can cause the symptoms like you have mentioned.