Hello,
There could be various reasons for dizziness and need to be evaluated. The most common causes are Hypotension, Anemia, Dehydration and Hypoglycemia. I would suggest you to get your blood pressure and sugar levels {fasting and post lunch} checked and get a complete blood picture done to rule out Anemia. The other possible causes could be hyperventilation, inner ear diseases, cardiac arrhythmias, stroke and brain tumors.
Get the blood sugar evaluated and an ECG done.CT brain is also useful if a brain injury is suspected to be the cause of vertigo. The choice of treatment will depend on the diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I would see your doctor as you may have an inner ear problem and/or sinus problems.