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You suffered head injury
about 3 year back and it was followed by a seizure episode. Your CT scan came normal at that time. The constant giddiness that is occurring can be due to long term sequel of head trauma
. If you are able to control the symptoms then there is no need to take medicines other wise there are a lot of medicines that can be used in such situations like Betahistine
, Vertin etc. These medicines provide symptomatic control of symptoms. Consult a doctor for detailed prescription.