For psychiatrist. Is it? or depression?

I was always a topper who used to get 90% but in 11th standard i dont know what happened to me that i became unwilling to study and chilling with frnds , always used to be in thoughts ,dreams , skipping classes , inattentive to classes , feeling bored with study & that leads me to continuous deceased performance in study Now in my graduation i have many backs but still i dont know why i cant able to study , if i try to study a chapter ,i cant sustain my concentration to it and a simple chapter takes 2 days to complete & my frnds surprise from this ,i only do things when it becomes do or die , i am unwilling to even bath So what is it ? A.d.d. or depression ? My psychiatrist told me that i have depression & G.A.D. and prescribed me escitalopram and buproprion Well 10mg and 150 mg of both cant helping me , it only improving my mood but still i cant study or willingness to study and i become tired if i forcely focus on boring sub. And while driving i forget gears in which it running