Suggest Treatment For Hair Fall And Dandruff

hi, i am just 17 and i have a lot of hair fall, i lost more than half of my hair in the last 2 years. i don't know what to do, i tried everything i could but never consulted a doctos about this. please help me. i did not have any other hair problems but recently i started getting dandruff and mine is basically dry skin. please give me some remedy for my hair problem.