Hi thanks for query. Based upon your statement I try to suggest few things, 1) is that your interested of different work apart from what it is assigned to you. 2) is that something you are forcing your self to work assigned, if yes, Why?  Is that resulting in distraction not to focus. 3) is there any negativity involved in your professional life. 4) is there any self expectations or stress to yourself in career life. You can try working yourself in this way. May  be you might find the result,  in the meantime you can visit psychologist.