Hello dear Greetings Regarding your symptoms of dizziness lightheadness and loss of sensation from the head shoulder down the arms I am suggesting the following differential diagnosis Cerebellar ataxia Cerebral encephalopathy Meningitis Myopathy Metabolic disorder In view of this please check your blood pressure do the following test Lumber puncture test CT SCAN BLOOD CULTURE SERUM ELECTROLYTES LEVEL Fasting blood sugar Serum creatine kinase Meanwhile please see a neurologist for expert clinical assessment Councelling and adequate drug prescription I hope this helps