Geodon (ziprasidone HCl and ziprasidone mesylate) is an atypical antipsychotic used to treat symptoms of schizophrenia and acute manic or mixed episodes associated with bipolar disorder. Geodon also can be used as maintenance treatment of bipolar disorder when added to lithium or valproate.So most common side effects of this drug includes is follow: feeling unusually tired or sleepy; nausea vomiting upset stomach loss of appetite constipation dizziness drowsiness restlessness anxiety headache depression abnormal muscle movements such as tremor shuffling and uncontrolled involuntary movements muscle pain or twitching diarrhea skin rash weight gain, and increased cough or runny or stuffy nose. Serious side effects of Geodon include fainting or loss of consciousness or heart palpitations. So your symptom may be due to a number of reason if it is due to drug you think change to other substitutes as per discussion with your doctor.Secondly if we consider it from pathological point of view do an MRI which will ruled out any pathological problem inside brain and spinal cords.Do ECG and ECHO when you go for MRI as well as do check your ear to ENT expert to ruled out any pathology inside middle ear which is responsible 90% cases of vertigo and headaches in our day to day life.So nothing to be serious on this matter.(Thanks)