Early Morning Headache. My problem!

When i was 6 yeas old i have minor head injury. so from that time i am suffering from headache but from last 8 year i have early morning heaviness in my head after 4 am. but only in front head.sometime in one side and sometimes in both sides. I feel burning sensation at that time in my head. i did all medical test like CT scan, MRI scan, EEG, ALL BLOOD TEST, EYE CHECK UP but no diseases was found. i took so many medicines after consulting many doctors like neurologist. they said i am suffering from migraine so they give me migraine medicine but my problem is increased day by day instead of decrease but after sometime i consult Ayurveda doctor he said there is blood clotting in your brain since head injury. he gave me medicine now i am feeling better little bit but early morning is same . After wake up when i take something like tea my headache decreased little bit... Whenever i travel or go outside from home, i feel headache more than before. Can anybody help me to diagnose my problem