Thanks for writing in.Dizziness
needs a complete evaluation of his nervous system. CT scan is an investigation which tells us about the brain injury
due to stroke. If its normal, blood supply from neck to brain also need evaluation by Doppler scan of carotid and vertebral arteries.
His blood glucose levels also need evaluation. Heart condition requires screening by ecg and echocardiography
Bleeding may be from stomach. A correct history of blood in vomiting must be evaluated and causes in esophagus
or stomach assessed.
Hope this helps.