I am 25 year male. I noticed I am facing some issues which are increasing day by day 1.I am not able to retain name new words and spellings when I study something 2. Many time I tend to forget what I was doing or my focus id diverted 3.I have developed a habit or repeating absurd and useless phase which I compulsively repeat frequently when I am busy or doing some thing. 4)  I remember my past  but I am not able to feel it that way which I used to feel before  my grand Fathers Death. I felt seriousness about this when my calculation speed is decreased and spelling mistakes has increased. Am I suffering from some problem or is this my illusion? What should I do to improve it?