Thank You, I Am 21 Years Old, I Have Been

Thank you, I am 21 years old, I have been suffering consatant headache for about 2 years, I try alot of medication but not succeed at all, i differed my studies at university, I feel hopless now, please help me, I feel like something burn inside my head also its worse when I am out in sun, I go to alot of hospital but they didn't succeed at all, please help me, Thanks