Hi... Welcome to healthcare magic.. According to your complain you have problem of headach and dizziness that may be because of high blood pressure problem.. Check your blood pressure first.. Lack of sleep and stress also cause headach problem... Dehydration also ruled out.. Mention a intensity and duration of pain with aggravating factor... Detail history and physical examination give exact idea... Consult a neurologist for further diagnosis.. I hope my guidance helpful to you.. Take care. Thank you.