Hello, I have gone through your query and understand your query. Yes. You should be concerned about this. Because you have symptoms of headache and lightheaded. If it is not associated with any bleeding or fever, then it is most probably due to stress or cardiac vascular diseases. 1. You have not mentioned the high blood pressure which you had initially. 2. Further do you have any existing heart disease? or on medications for blood pressure? 3. In some people, at times anxiety and stress may increase the blood pressure and return to normal once they avoid such situation or after taking rest. If you have not had any investigation earlier, you need complete examination and cardiac assessment including Electrocardiogram, Echocardiogram, Treadmill test. If there is any findings suggestive of heart disease, then it need to be treated. Hope this helps. Please write back for further queries. Wishing you good health.