To get explanation on my problem.

Hello doctor I don't know what is happening to me, ever since I have hair fall and dandruff problem it just affect me mentally and physically, I remember when I was 16years old I had a good hair it was smooth, straight and the oilyness of my hair is well balanced but since I attained 17years hair fall started to appear followed by dandruff and my hair feels coarse dry more oilier than before ,even in a single strand there would be uneven thickness some at the root is thin and middle all to the top is thick and before all of this to happen when I cut my hair short also it in the same way but now most of them are curly and thicker than the he normal hair strand I have consulted a dermatologist here in my city but it still not showing any good results