Thesis writing versus journal writing

I found it extremely difficult to concentrate on reading one journal, let alone writing the whole chapter of literature review. This is totally different compared to journal writing, as for journal writing it is short and concise. I would only concentrate on the introduction and discussion part, as the methodology and result is well taken care of with my analysis. Introduction is simple, as it outlined the aim of our analysis, and discussion looks at the current literature pertaining to the topic, and discuss our finding. Much more simpler than literature review! Because of the vast interest in the area that I am working on, there are literally hundreds if not thousands of literatures that comes out over the past 2 years. Even to read one journal took me more than 1 day (as I do not have the ability to concentrate).........now I am at loss. Don't know how can I cope with completing this chapter. Furthermore, two of the hypothesis that I would like to test in the coming trials had recently being published by other investigators.......even one chapter that I have recently published also has been recently described by other author......how can I contribute significantly to this field then? Have this phd journey trained me to become independent researcher? Or am I too dependent upon my supervisor? These questions continue to pop up in my mind...albeit the positive feedback that I received, I am constantly questioning myself. Is there light at the end of this tunnel? Yakin and tawakal to Allah swt is my only pegangan....