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Thanks for your question.
You have done all the correct things by consulting a neurologist and an ENT surgeon. However as your doctor said this could be due to anxiety as well. But as you are rightly concerned a complete blood count is essential as well as heart related tests to rule out disturbances in the rhythm of the heart which may cause dizziness lasting for several seconds or longer. The next step would be to have basic investigations such as complete blood count, a fasting blood glucose, and an electrocardiogram to be done. Based on the results your doctors can proceed further.