Headache for last 4 yrs. Of my neck.

Namaste! I'm a student. I'm having frequent headche for the past 4 yrs...i can't remember much what i study except my temporary memory..i used to be very good... I've experienced an acident syncope once while playing in water pool 8 yrs back.where i got hit on back of my neck.for sometime ,i frgt the place where I had visited and lost part of my memory of recent visits i had which ma parents told me.. I'm not aware of what happened for that stipulated time till now....the doctor who treated immediately said i was okay to go. over the yrs, I've taken some pills for migraine, sinus after consulting doctors for headache...not taking any now...but my problem now is, i get headache a day before exam.i can't get rid of it.and couldn't sleep for whole day...my parents do not stress me on studies nor do i or anyone.im pretty sure it is not because of stress..the headache covers my whole head.. specially the on my parietal parts of brain.i need proper treatment for my headache.I am also fat..