I am having headache from past 8-10 days..i don't know the reason but it happens daily around 11-12 am in the morning or in afternoon and in night...?

Headache log: You might try keeping a detailed headache log. This should include the timing, careful descriptions of the location, type (sharp, dull, throbbing, etc) and severity of the pain (1-10) and what you were doing/eating, etc right before. And don't forget to include what you did about it and whether or not it worked. Take this to the doc when you go to get checked out and it should help a lot.

Parasites: According to meridian theories if you have disharmony in spleen (10am-12noon) there would be back up congestion causing headaches consistently same time. Cause of spleen disharmony is usually parasites - sources of parasites are meat esp pork, tooth, gut so need a parasite cleanse.